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I have a 2006 Saturn VUE Base 3.5L, a year ago a changed the catalytic converter on bank 1 because the OBDII reads a code P0420, so instaled the new OE converter from GM, but now I get the car to the

Code fault P0420,still even with a 10 months old converter. Do I have to buy a new $730 new converter? It didn't pass the smog check for California.

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SOURCE: check engine light on 2005 saturn vue

more common is the o2 sensor

Posted on Mar 20, 2009

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SOURCE: Check engine light 2005 Saturn Vue

the scan tool that you are using will not read codes from all of the modules. take the car to a gm dealer to have it checked with a tech2

Posted on Apr 08, 2009

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P0420 fault not going away

covers other aspects as well.

P0420 Chevrolet - Catalyst System Low Efficiency Bank 1 Repair Importance Level: 2/3 Repair Difficulty Level: 2/3 alt="What does this mean?"> alt="PDF"> alt="Share Code"> 3 alt="P0420 Chevrolet Comments"> ' Add Comment alt="Close Selection"> Forum Code Possible causes - Three way catalyst converter Bank 1
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Powertrain Control Module (PCM)
alt="What does this mean?"> What does this mean? 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 needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.
alt="What does this mean?"> What does this mean? When is the code detected? If a condition exists which causes the Powertrain Control Module (PCM) to detect excessive Bank 1 HO2S #2 activity outside of an acceptable range for an extended period of time, the PCM will set the P0420 code. This indicates that the three-way catalytic converters oxygen storage capacity is below a threshold considered acceptable. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light) P0420 Chevrolet Description In order to maintain a reasonably low emissions of Hydrocarbons (HC), Carbon Monoxide (CO), and Oxides of Nitrogen (NOx), the engine controls system uses a three-way catalytic converter. The catalyst within the converter promotes a chemical reaction which oxidizes the HC and CO present in the exhaust gas. This reaction converts them into harmless water vapor and Carbon Dioxide. The catalyst also reduces NOx, converting it to Nitrogen. The Powertrain Control Module (PCM) monitors this process using Bank 1 HO2S #2. Bank 1 HO2S #2, located in the exhaust stream past the three-way catalytic converter, produces an output signal which indicates the oxygen storage capacity of the catalyst. This determines the catalysts ability to convert exhaust emissions effectively. If the catalyst is functioning correctly, the Bank 1 HO2S #2 signal will be far less active than that produced by Bank 1 HO2S #1.

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Sep 29, 2015 | 2009 Chevrolet Lumina SS

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How do I fix this code p0420

You need to have it check out by a qualified repair shop because you don't want to guess on this one ! This has to do with the catalytic converter , if it's work or not ! The car needs to be hook up a up scale scan tool to check it out . Catalytic converters can cost as much as a Thousand dollars , so you want to be sure ! How To Diagnose Check Engine Light Code P0420 Catalyst Bank 1

Mar 14, 2015 | 2001 Dodge Grand Caravan

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What is wrong when this code shows up p0420 shows up..This is a 2006 nissan sentra

P0420 NISSAN - Catalytic Converter Efficiency Below Threshold Bank 1

The most common cause for the OBDII code P0420 on Nissan vehicles is the three way catalytic converter Bank 1 has reached the end of its useful life.. Since this is a very expensive part you need the code fully diagnosed as some other things like exhaust leaks or poor engine tune can cause it as well

Oct 05, 2012 | 2006 Nissan Sentra 1.8

2 Answers

I have a codes for a 2003 saturn vue reading p0420

It is pointing to a bad catilatic converter, as well as possibly, 02 sensor. Hope this help you, thanks. Mike from fixya

Jun 13, 2011 | Saturn Vue Cars & Trucks

1 Answer

2 codes 1) P0420 catalytic converter system below threshold (bank 1) 2) P0420(Pd) catalytic converter below threshold (bank 1)

possible causes for code po420 airleaks at the exhaust manifold or in the exhaust pipes,base engine problems high engine oil or coolant usage,catalytic converter is damaged contaminated or has failed,continuos engine misfire conditions or weak or low coil out put,front HO2s or rear HO2s is contaminated with fuel or moisture,rear HO2s is loose in the mounting hole,front HO2s older aged than the rear HO2s or HO2s 1 - 2 is lazy.

Mar 31, 2011 | Chevrolet Equinox Cars & Trucks

3 Answers

Po420 code monte carlo ls 2001

PO420 code is for catalyst system efficiency below threshold (bank 1) Usually it means that it is time for a new catalytic converter on bank number 1. Cylinder bank number 1 is always the bank with the number 1 spark plug in it.

Apr 20, 2010 | 2001 Chevrolet Monte Carlo

2 Answers

Code p0420 appears what does it mean engine lite came on

P0420 Catalyst System Efficiency Below Threshold (Bank 1)

What does that mean? The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms You will likely not notice any drivability problems, although there may be symptoms.
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
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Possible Solutions Need a catalytic converter? Visit our catalytic converter shopping area for the lowest price on your replacement converter!
Some suggested steps for troubleshooting a P0420 error code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.

Nov 03, 2009 | 2007 Chrysler Town & Country LX New Cars

1 Answer

P0420 code shows

P0420 Catalyst System Efficiency Below Threshold (Bank 1)
You have a worn out catalytic converter.

Apr 17, 2009 | 1996 Saturn SL

3 Answers

2003 Saturn Vue V6 2WD catalytic converter problem

I am sorry but the delaer is correct, there are 3, and the bad news is the after market cats won't work, the check engine light will come on if you use them and for that reason you will fail smog tests, the issue is how much they flow and the way they work is not compatable with the programming of the powertrain control module, stick with the factory cats, I know they are expensive but in the end you will have to buy them.

Dec 04, 2008 | 2003 Saturn VUE

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