2010 nissan altima p0420

Tips and tricks for cleaning a catalytic converter in your car and fixing code NISSAN P0420. Fix Engine Code NISSAN P0420 Easy DIY Method A | Catalytic …

Causes and Fixes Nissan P0420 Code: Catalyst System Efficiency Below Threshold Bank 1. HVAC Mechanic. 21.1K subscribers. 12K views 3 months ago. How To Fix a Nissan P0420 engine code:...What Does Nissan Code P0420 Mean? Nissan P0420 definition: Catalyst system efficiency below threshold (Bank 1) Issue Severity: MODERATE – Extended …Code P0102 Nissan Tech Notes. Before replacing the Mass Air Flow (MAF) Sensor, try replacing the air filter and cleaning the Mass Air Flow Sensor with low compress air or Mass Air Flow Sensor Cleaner. Reset code and drive vehicle. If the code comes back, you must replace the Mass Air Flow Sensor to fix the problem. User Submitted Video.Code P0420 Description. The Engine Control Module (ECM) uses sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency. The first sensor, the air-fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, sends post-catalyst information to …Re: Service engine soon. Postby armybrat » Sat Dec 31, 2016 10:23 am. My understanding is that the O2 sensor before the cats control the A/F ratio, and the one after the cats verify proper cat operation. It could also be a faulty cat. On the M56 the cat is integrated into the exhaust manifold as one unit. I think bank 1 is the driver's side ...

Wife drove car today and came in saying light came back on. Scanned code and it is now showing P0420, which I know is the pre-cat. I am also aware of the problems with this engine starting in 02 with the pre-cats. Went ahead and cleared code and figured I would give it a few days to see what happens.Altima SSS · #4 · Apr 2, 2009. dloudy said: I keep getting the P0420 code, and he said it means my 1st cat is bad.....since I have 128K on the car. I checked the oil today, and it's only about 1/4 qt. or so low....nothing alarming. I change oil religiously every 3,000 to 3500 miles.Altima SSS · #4 · Apr 2, 2009. dloudy said: I keep getting the P0420 code, and he said it means my 1st cat is bad.....since I have 128K on the car. I checked the oil today, and it's only about 1/4 qt. or so low....nothing alarming. I change oil religiously every 3,000 to 3500 miles.DTCs for the 2010 Nissan Altima follow the trend of other years, with P0420 being one of the most common. It is followed by P0128 , a coolant thermostat costing between $2,049 and $2,567. Recalls issued by the NHTSA are low for this model year, with three, and the 2010 Altima only has 351 complaints.Is your car showing the P0420 trouble code? No need to panic. KBB.com will explain what you need to know about low catalyst system efficiency repairs.2010 Nissan Altima P0420 : Troubleshooting and Fixing. August 7, 2023. P1815 M Mode Switch : Unlocking the Secrets of Your Vehicle’s Transmission. August 6, 2023. Ca18det Vs Sr20det : Unraveling the Battle of Nissan’s Legendary Engines. August 4, 2023. Sr20 Supercharger : Unleashing the Power Within. August 3, 2023. Recent Posts. Kia K3 …

Jun 18, 2010 · Hmmm, waking up a 6+ year dead thread... So be careful, the P0420 code can often mean far more serious things are wrong with the engine. At least your car is of the age and mileage where a new cat and/or pre-cat could reasonably be needed, Inspect the top of the precat element careful for signs of breakdown and stop there before spending any more money as the engine could be toast (google ... Here are the most common causes of P0420 in the Nissan Altima: Likely Causes. Bad catalytic converter; Bad O2 sensor; Other Causes. Exhaust leak; O2 sensor wiring; PCM issue; Overheating converter (usually caused by a misfiring engine, there should be codes) Burning oil (overheats converter, usually no code) Engine not heating up enoughHow To Fix a Nissan P0420 engine code: Catalyst System Efficiency Below Threshold Bank 1Link to Cataclean on Amazon: https://amzn.to/3TSI6xWHow To Test Oxyge...The air fuel ratio (A/F) sensor measures oxygen content of the exhaust in a wider range. It is also known as the "broadband lambda sensor" or "lambda probe." The air fuel ratio sensor is installed in the exhaust manifold or in the front exhaust pipe, before the catalytic converter. It might also be called 'front O2 sensor'.For example, fouled spark plugs and ignition coil packs because of a bad valve cover. I replaced it and car is running well. Then I get code p0420, I sometimes get excessive smoke from tail pipe during some cold day startups. I took to mechanic for diagnostics to find which catalytic converter is bad. From my understand my car has two …2010 Nissan Altima P0420 : Troubleshooting and Fixing; P1815 M Mode Switch : Unlocking the Secrets of Your Vehicle’s Transmission; Ca18det Vs Sr20det : Unraveling the Battle of Nissan’s Legendary Engines; Sr20 Supercharger : Unleashing the Power Within

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May 18, 2019 · Diagnosis and replacement of a Catalytic Converter on a 2006 Nissan Altima 2.5L which had a P0420 code (Low Catalytic Efficiency)Disclaimer:Due to factors be... Oct 17, 2021 · 2004 Nissan Altima 2.5 S. Re: Code P0420. Postby VStar650CL » Sun Oct 17, 2021 8:01 pm. Dunno what you mean by a "fuel sensor" code. If you mean the A/F sensor, then yes, a faulty one can cause a false cat efficiency code. Other possible causes are an exhaust leak, plenum gasket leak, or a replacement cat that isn't as efficient as the original. Hi, I recently got this code about a day ago so far I replaced the 2nd o2 sensor, but the check engine light is still on. My code says. P0420. Catalytic converter system, …The P2A00 code refers to an issue that the Power Control Module (PCM) detects with the voltage readings given by the oxygen Sensor 1 on your car’s Bank 1 side. The Bank 1 denotes the side of the ...This Control Area Network (CAN) communication line is used to control the smooth engine operation during the Anti-Lock Brake System (ABS) or Traction Control System (TCS) operation. Pulse signals are exchanged between Engine Control Module ( ECM) and ABS actuator and electric unit (control unit). P1212 Nissan Code - ABS/TCS …Nissan has issued a service bulletin NTB17-082a to address a P0456 Nissan trouble code. Home; Make & Model; Repair Topics; More Articles. Alex's Tips for Teens; ... 2014-2009 350Z Roadster (Z33) 2010-2018 370Z Roadster (Z34) 2008-2013 Altima Coupe (L32) 2007-2012 Altima Sedan (L32) 2013-2017 Altima Sedan (L33) 2004-2015 Armada …

Feb 22, 2010 · AceCombat. 989 posts · Joined 2006. #8 · Mar 5, 2010. No the p0420 code is for the catalyst control being below threshold. In other words temp not hot enough cat is screwed possible engine damage to follow very soon get it fixed. 2 dollar part wil lnot fix this problem just because the little light went out doesn't mean that engine damage has ... 236 posts · Joined 2009. #3 · Jun 19, 2010. I am looking under the car now. I see 4 main components from engine to bumper. 1). Exhaust manifold with precat. 100% sure. 2). main cat not completely sure. 3) resonator (very long) not sure. 4) muffler (right by the bumper) not sure.Fixing P0128 in the Nissan Altima is usually a pretty easy thing to do since, 90% of the time, a stuck thermostat will cause the problem. Here are the most common causes of P0128: Thermostat Stuck Open – Far and away, the most typical cause for the P0128 code is a thermostat that is stuck open. When a thermostat is stuck open, it allows ...Labor: 1.0. The cost to diagnose the P1148 Nissan code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto …Tips and tricks for cleaning a catalytic converter in your car and fixing code NISSAN P0420. Fix Engine Code NISSAN P0420 Easy DIY Method A | Catalytic Converter Cleaner (1) Get a...Injector cleaner was a temp fix on my 2005 Altima S AT 130k. We baby this car and well maintained. it seems the Nissan P0420 code overrides other codes. This maybe why no crankshaft code, but the fix so far is the crankshaft sensor!Dec 20, 2022 · Nissan Altima P0300 Symptoms. Check Engine Light is on or flashing. Engine runs rough, hesitates, or jerks when accelerating. Drivers may not notice any adverse conditions when driving. In some cases, drivers may experience decreased fuel economy, fuel smell from exhaust, rough idling, or lack of power from the engine. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient …

StanzaDescendant · #14 · Jun 10, 2010. The p0420 code is catalytic inefficiency. The ECU will measure the voltage between the primary and secondary O2 sensors and if it does not sense enough of a drop it will throw that code which would be the case when the main cat is not functioning correctly.

Re: V8 P0420 & P0430 codes. The catalytic converters are integrated into the manifold. Postby DenisMcG » Sat Jan 12, 2019 1:13 pm. But is the flow actually restricted. In the case of my FJ Cruiser, the code issue was caused by the addition of a cat-back magnaflow system, which caused an increase in exhaust flow.Code P0420 2010 Nissan Altima Sedan Tech Notes. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting).As the Nissan P0420 code description implies the Nissan P0420 code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to ...The P0420 code signals a low catalyst system efficiency. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car ...Most people got P0420 because of the exhaust manifold, that doesnt mean your problem is the pre-cat. It could be your o2 sensor or something else. To test your pre-cat, you will have to take it off and look into the internal. If there are metal pieces fall off from the manifold, then you will need a new manifold...May 11, 2010 · Postby mateen110 » Fri May 09, 2014 10:01 am. So I got code P0420 thrown at me, and after some research I found that its the passenger side catalytic converter. The code only tells me "cat below efficiency threshold (bank 1)" and not which of the two passenger side cats (Front or back) it is. Last time, I had code P0430 I thought it told me ... To diagnose the P0448 Nissan code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Feb 22, 2010 · AceCombat. 989 posts · Joined 2006. #8 · Mar 5, 2010. No the p0420 code is for the catalyst control being below threshold. In other words temp not hot enough cat is screwed possible engine damage to follow very soon get it fixed. 2 dollar part wil lnot fix this problem just because the little light went out doesn't mean that engine damage has ...

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Jun 28, 2010 · Causes: A code P0420 may mean that one or more of the following has happened: * Leaded fuel was used where unleaded was called for. * An oxygen sensor is not reading (functioning) properly. * The engine coolant temperature sensor is not working properly. * Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe. 2010 Nissan Altima P0420 : Troubleshooting and Fixing. August 7, 2023. P1815 M Mode Switch : Unlocking the Secrets of Your Vehicle’s Transmission. August 6, 2023. Ca18det Vs Sr20det : Unraveling the Battle of Nissan’s Legendary Engines. August 4, 2023. Sr20 Supercharger : Unleashing the Power Within.236 posts · Joined 2009. #3 · Jun 19, 2010. I am looking under the car now. I see 4 main components from engine to bumper. 1). Exhaust manifold with precat. 100% sure. 2). main cat not completely sure. 3) resonator (very long) not sure. 4) muffler (right by the bumper) not sure.Code P0031 Nissan Tech Notes. The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow, which is a very common problem for this type of code. Before replacing the sensor, check for the condition of ...Apr 8, 2010 · B. bob1234 Discussion starter · Apr 8, 2010. Sad to say, but I have the P0420 code on a 2005 2.5L Altima with 126,000 miles. I called the dealer and found out the ECM reprogram is around $100. What are the chances the ECM reprogram will solve the problem instead of buying a new precat/header? 2005 2.5L. Jul 23, 2023 · The P0455 it’s very common code because the code is set if the gas cap is loose or missing. Start by tightening the gas cap and clearing the code. In most cases, the code can be clear by disconnecting the car battery for about 30 minutes. There is a factory Nissan service bulletin to help diagnose the P0455 code: Nissan Factory Service ... I later pulled codes P1610 and 1614. Both P1610 and P1614 indicate a NATS (anti-theft system) malfunction, yet P1610 is a resulting DTC from the "LOCK MODE" condition which is set for various NATS malfunctions or an improper key being used. It prevents the car from starting (for some period of time, even if the key issue is rectified).The P0420 code signals a low catalyst system efficiency. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car ... ….

2023 Nissan Rogue Platinum Sl New For Sale 2010 2023 Nissan Rogue Update. The new generation Nissan Rogue brings a new look to this compact crossover, including a boxy front end, ... 2010 Nissan Altima P0420 : Troubleshooting and Fixing. August 7, 2023. P1815 M Mode Switch : Unlocking the Secrets of Your Vehicle’s Transmission.2023 Nissan Pathfinder. ... 2010 Nissan Altima P0420 : Troubleshooting and Fixing. August 7, 2023. P1815 M Mode Switch : Unlocking the Secrets of Your Vehicle’s Transmission. August 6, 2023. Ca18det Vs Sr20det : Unraveling the Battle of Nissan’s Legendary Engines. August 4, 2023. Sr20 Supercharger : Unleashing the Power Within. …i have an 02 nissan altima with a no start no crank issue, i can have ignition on and jump the starter and the car runs checked 12v at the main power terminal at the started checked fuse-able link continuity test at the ipmd to the started trigger wire good 12v at the ipmd when key on 12v at the start relay terminal when cranking.2010 Nissan Ellure Concept 2010 Nissan Cube 2010 Nissan Altima Sedan 2010 Nissan Altima Coupe 2010 Nissan 370Z Roadster 2010 Nissan 370Z Black Edition 2009 ...P0420日産コードの修理情報。 P0420日産触媒システムのThreshold Bank 1を下回る効率とはどういう意味ですか？As the Nissan P0420 code description implies the Nissan P0420 code means that the vehicle’s control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to ... Mar 13, 2023 · OBD II fault code P0420 is a generic code that is defined as “Catalyst System Efficiency Below Threshold (Bank 1)”, and is set when the PCM (Powertrain Control Module) detects a condition that indicates that the catalytic converter on Bank 1 is operating below the minimum allowable efficiency threshold. Note that on engines with two banks ... 2008 Altima 2.5SL. Save. Mike James · #3 · Jul 7, 2016. P0420 is a significant issue on the 2.5. It is overwhelmingly a converter issue. I would see if there is any warranty left on the converter you purchased from rock auto. Altima traded for Odyssey. Current - …i have an 02 nissan altima with a no start no crank issue, i can have ignition on and jump the starter and the car runs checked 12v at the main power terminal at the started checked fuse-able link continuity test at the ipmd to the started trigger wire good 12v at the ipmd when key on 12v at the start relay terminal when cranking.Oct 11, 2021 · I got the codes P0171 and P0420. Nissan Altima. 2010 .2.5 L. ... hello i have a 2002 2.5 nissan altima the code p0420 is coming up when i put the computer to it now ... 2010 nissan altima p0420, OBD II fault code P0420 is a generic code that is defined as ““Catalytic Converter System Bank 1, Efficiency below Threshold”, and is set when the PCM (Powertrain Control Module) detects that the catalytic …, Postby Rogue One » Mon Jan 25, 2016 9:56 pm. P0420 NISSAN ROGUE - Catalyst System Efficiency Below Threshold Bank 1. Tech notes. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting ..., Code P0430 Nissan Tech Notes. As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the catalytic …, Aug 15, 2019 · front oxygen sensor, the PCM will set code. P0420.Catalytic converters are covered under. federally mandated 8yr/80,000 mile warranty by. the vehicle's manufacturer. Catalytic converters. usually fail as a result of something else (engine. misfire, internal oil leak, or internal coolant leak) not being repaired. The original cause of the failure. , Jun 19, 2020 · Code P0420 Nissan Tech Notes. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the catalytic convert ... , 2010 Nissan Altima P0420 : Troubleshooting and Fixing. August 7, 2023. P1815 M Mode Switch : Unlocking the Secrets of Your Vehicle’s Transmission. August 6, 2023. Ca18det Vs Sr20det : Unraveling the Battle of Nissan’s Legendary Engines. August 4, 2023. Sr20 Supercharger : Unleashing the Power Within., 2023 Nissan Leaf Leasing Buy Chevy Auto 2010 2023 Nissan Leaf Update. Its newly reduced price tag is a big part of the Nissan Leaf 2022’s appeal, but its less-than-stellar range means other mainstream electric vehicles are more practical and worth more money. ... 2010 Nissan Altima P0420 : Troubleshooting and Fixing. August 7, 2023. P1815 M …, May 17, 2016 · 2008 Altima 2.5SL. Save. Mike James · #3 · Jul 7, 2016. P0420 is a significant issue on the 2.5. It is overwhelmingly a converter issue. I would see if there is any warranty left on the converter you purchased from rock auto. Altima traded for Odyssey. Current - 08 HIGHLANDER. , 2010 Nissan Altima P0420 : Troubleshooting and Fixing. August 7, 2023. P1815 M Mode Switch : Unlocking the Secrets of Your Vehicle’s Transmission. August 6, 2023. Ca18det Vs Sr20det : Unraveling the Battle of Nissan’s Legendary Engines. August 4, 2023. Sr20 Supercharger : Unleashing the Power Within., Receiving engine code p0420 on my 2005 altima 2.5 s. A p0420 code indicates a Catalytic System efficiency failure, Bank 1. Basically, the computer is seeing reduced efficiency of the catalytic converter or one of it's components (such as an 02 sensor) There may be a few root causes, such as a faulty oxygen sensor, faulty coolant temperature ..., Nissan Altima Check Engine Light Due to Failure of Catalytic Converter Closest to Cylinder Head - 599 reports. ... 2010 Nissan Altima 100,945 ... received code P0420 ..., 2010 Nissan Altima code P0420 2 Answers. Was driving my car home from work last week and it popped the Service Engine light on with code P0420, referencing the catalytic converter. Here is full description: The Catalytic Converter takes t..., Oxygen sensors are only a part of a greater system, meaning if the p0420 code (or p0141, or p0135) is thrown, that doesn’t necessarily indicate the oxygen sensors need replacement. Rather, there could be something else in that system does that’s causing the oxygen sensors to appear faulty. This is actually the case with most check engine codes., Causes Seriousness Can I Still Drive? Diagnose Difficulty of Inspecting Get Additional Help The P0420 code signals a low catalyst system efficiency. This code suggests that the …, 2024 Nissan Murano. Nissan has improved the Altima and Murano, making them more enjoyable to drive. Consider the Acura TLX and Honda Accord as examples of comparable vehicles. Most individuals will find it appealing and enjoyable to drive. This vehicle’s crash test scores are also favorable. Contents hide 1 2024 Nissan Murano Design 1.1 2024 Nissan …, Step 1. Get Oxicat Catalytic converter cleaner. The easiest way to clean a catalytic converter without removing it is by using a catalytic converter cleaner product. We recommend the OXICAT – Oxygen Sensor & Catalytic Converter Cleaner. You can find more of these products in our guide: Best Catalytic Converter Cleaners., longbodie Discussion starter. 73 posts · Joined 2010. #1 · Jul 21, 2018 (Edited) Hi everyone, just got the check engine light on, 07 2.5, brought it to advanceautopart they scanned it, showing "P2A00 code Oxygen sensor Bank 1 Sensor 1 open circuit". Looks like there are 2 O2 sensors, upstream and downstream, don't know which one is bad., DTCs for the 2010 Nissan Altima follow the trend of other years, with P0420 being one of the most common. It is followed by P0128 , a coolant thermostat costing between $2,049 and $2,567. Recalls issued by the NHTSA are low for this model year, with three, and the 2010 Altima only has 351 complaints., The P1778 code defined as “Transmission Reverse I/P1778 Circuit Malfunction” is only applicable to certain types of Nissan vehicles. It’s an extremely narrow range of vehicles, and even in ..., Jun 28, 2010 · Causes: A code P0420 may mean that one or more of the following has happened: * Leaded fuel was used where unleaded was called for. * An oxygen sensor is not reading (functioning) properly. * The engine coolant temperature sensor is not working properly. * Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe. , The P0420 code signals a low catalyst system efficiency. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car ... , P0420 – 2010_NISSAN_ALTIMA_SEDAN - CarDiag : Your Easy Car Diagnostic - Vérifiez l'état d'une voiture d'occasion avant de l'acheter. Roulez sereinement sans la peur de la …, To diagnose the P0075 Nissan code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour., AceCombat. 989 posts · Joined 2006. #8 · Mar 5, 2010. No the p0420 code is for the catalyst control being below threshold. In other words temp not hot enough cat is screwed possible engine damage to follow very soon get it fixed. 2 dollar part wil lnot fix this problem just because the little light went out doesn't mean that engine damage has ..., Nissan Altima/Stanza. 4th Generation Altima (2007-2012) 2010 altima 2.5 p0420. Jump to Latest Follow 9187 Views 12 Replies 2 Participants Last post by 2010altima, Jul 28, 2016. 2. 2010altima ..., Code P0420 Nissan Tech Notes. As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases, the catalytic convert ..., Oxygen sensors are only a part of a greater system, meaning if the p0420 code (or p0141, or p0135) is thrown, that doesn’t necessarily indicate the oxygen sensors need replacement. Rather, there could be something else in that system does that’s causing the oxygen sensors to appear faulty. This is actually the case with most check engine codes., Jun 27, 2020 · Snowyy. Discussion Starter · Jun 27, 2020. Hi, I recently got this code about a day ago so far I replaced the 2nd o2 sensor, but the check engine light is still on. My code says. P0420. Catalytic converter system, bank 1-efficiency below threshold. Catalytic converter, wiring, H02S 2. , 2010 Nissan Altima P0420 : Troubleshooting and Fixing. August 7, 2023. P1815 M Mode Switch : Unlocking the Secrets of Your Vehicle’s Transmission. August 6, 2023. Ca18det Vs Sr20det : Unraveling the Battle of Nissan’s Legendary Engines. August 4, 2023. Sr20 Supercharger : Unleashing the Power Within., , Receiving engine code p0420 on my 2005 altima 2.5 s. A p0420 code indicates a Catalytic System efficiency failure, Bank 1. Basically, the computer is seeing reduced efficiency of the catalytic converter or one of it's components (such as an 02 sensor) There may be a few root causes, such as a faulty oxygen sensor, faulty coolant temperature ..., The 2010 Nissan Altima is a reliable and popular vehicle known for its performance and efficiency. However, like any car, it can experience issues over time. One of the common problems that Altima owners might encounter is the P0420 code, which relates to the catalytic converter’s efficiency., Nissan Altima Check Engine Light Due to Failure of Catalytic Converter Closest to Cylinder Head - 599 reports. ... 2010 Nissan Altima 100,945 ... received code P0420 ...