Question about 2003 Chevrolet Impala

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P0420 bank 1 2003 impala 3.4 litters during idle

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This code is for catylist efficientcy below normal. Change the catalytic convertor. Good luck!

Posted on Oct 20, 2010

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Posted on Jan 02, 2017

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How to fix p0420 code


Failed exhaust converter (bank #1)

Fix the reason it failed before replace it

The motor needs work

Mar 14, 2013 | 2003 Chevrolet Impala

1 Answer

P1404 code and p0420 car stalls


The P1404 means Driver Power Window Down Circuit Open
and the P0420 means Catalyst System Efficiency Below Threshold (Bank 1)
___________________
hid xenon headlight

Sep 18, 2012 | 2001 Chevrolet Impala

1 Answer

Says that my catalyst system efficiency is below threshold bank 1-code p0420 catalyst convertor is new and check engine ligh back on ,2003 impala,what do i do now ,i have replaced sensors and car is...


Afraid you will need a mechanic for this one.
If the engine is running hot you could have a restriction in the exhaust.
We can check exhaust flow with a Infared thermometer.

Jun 30, 2012 | 2003 Chevrolet Impala

1 Answer

I have a 2002 impala it showing troubleshooting p0420 OEM brand: domestic. What is the major problem


could be intake gaskts leaking causing this or could be bad cat. convertor on bank 1 cylinder head, could be as simple as a bad spark plug causing that bank to run nonefficient. Bank 1 is the cylinder head that is the closest to you when standing on r side of car looking at engine (passenger side) you will see one head which is closer to you than the other...that is Bank 1

Feb 16, 2012 | 2002 Chevrolet Impala

1 Answer

2004 Chevy Impala SS 3.8L Supercharged: I am getting OBD2 codes P0171 (System too Lean (Bank 1)) and P0420 (Catalyst System Efficiency Below Threshold (Bank 1)). I also found an oil leak today. I...


for p0171, try:
In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure
for p0420, try:

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

Aug 23, 2011 | 2004 Chevrolet Impala

1 Answer

My 2002 Ford Escape is poping up code p0420 and p1507 what is it?


Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency Below Threshold (Bank 1)

Answer P1507 means "Idle Air Control Underspeed Error". It can be most commonly caused by a vacuum leak, a damaged Idle Air Control (IAC) assembly or a stuck IAC valve that ...

Aug 17, 2010 | 2002 Ford Escape

2 Answers

2001 Toyota Sequoia is showing a P0505 and PO420 error code; how do you correct these issues.


P0505 Idle Control System Malfunction

IACV or Idle Air Control Valve if equipped is malfunctioning.

P0420 Catalyst System Efficiency Below Threshold (Bank #1)
The Catalytic converter is not working up to par in Bank#1.

I think this will point you in the right direction..



Jul 16, 2010 | 2001 Toyota Sequoia

1 Answer

Radiator fans fuses keep blowing-chevy impala 2002. we need info on following codes: P0108, P0128, P 0341, P 0401, P 0420, P 1480, and P 1481. John


p0108 map curcuit high input, p0128 coolant temperature below thermstat regulating tempurature, p0341 is camshaft position sensor A-bank 1 ckt range/performance, p0401 is exhaust gas recirculation, insufficiant flow detected, p0420 is catalyst system efficiency below threshold, p1480 is manufacturer control auxilary emission controls, p1481 is same as p1480.

Jun 15, 2010 | 2002 Chevrolet Impala

1 Answer

3 codes present on my 2002 Envoy. p0172, p0420, and p0340,


Track the p0340 first camshaft timing is very important and could possibly cayse your other codes,Call your local GMC dealer I think I remember a bulletin about this code.

Aug 21, 2009 | 2004 GMC Envoy

1 Answer

2005 Ford Taurus SE 3.0L V6 OBD Codes P0171 and P0174


The P0420 code is a Catalytic converter efficiency code check the compression.Swap the #1 injector to a different location to see if the code follows.Test the coilpak. A cracked exhaust manifold is the most likely cause p0171 and 0174 Induction air leaks, vacuum or some kind fuel restriction, weak fuel pump, restricted fuel filter etc.You also could have an exhaust leak near the upstream o2 sensor. If youtake it in they will probably use smoke to find out where the leak is.

Apr 22, 2009 | 2001 Ford Taurus

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