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Chevy impala 3.4 obd2 code po128

Code po128

Posted by Anonymous on

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Posted on Jan 02, 2017

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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

  • 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.
You need to learn to use the scanner and interpret the readings (usually the scanner manual contains the meanings to these codes)

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 128 is for the engine not warming up to normal temp.
Usual problem is a faulty thermostat.

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Abs light stays on 2001 chevy impala

Hey, it should be able to be reset. I have a 2005 Chevy cobalt and Ihad the same problem but my manual told me how to clear it up, so you should check in the manual to see how.
OBD2 code scanner

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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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How do you reset the check engine light on a 2004 Chevy Imapla?

You will have to have a code reader or scanner to plug up to the obd2 connector to erase the code.

Oct 12, 2010 | 2004 Chevrolet Impala

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Why does my engine light stay on in a 2001 chevy impala

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