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Chevy impala 3.4 obd2 code po128

Code po128

Posted by Anonymous on

3 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 10 Answers

SOURCE: on a 2002 chevy impala with a 3.4 engine. iget code po303.

replace all wires and plugs with ac delco parts only iradium plugs only!!

Posted on Dec 24, 2009

nicole99wu
  • 1049 Answers

SOURCE: 2004 Chevy Impala SS 3.8L

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

Posted on Aug 23, 2011

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2007 chevy impala codes coming up are 7e8 and 7ea. what do i look for


Seems to be a scanner component ID, not the OBD2 fault code.
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Otherwise you need to take the car to an independent service with Chevrolet specific scan tools or a Chevrolet dealer, for proper diagnostics.

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Code PO128 CHEVY EQUINOX


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I have a 2006 chevy Impala 3.5 v6 Flex fuel with OBD code po446 what is it and where is it Dennis


this obd2 trouble code table can help you understand the meaning of code.

for p0446, you can try:

Replace Vent valve

Repair open, short, or resistance problem in control circuit

Repair open, or short, or resistance problem in power circuit

Replace PCM

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