What is causing this Check engine light

5

Asked by Oct 10, 2016 at 05:11 PM about the 2006 Chevrolet Impala 3.5L LT FWD

Question type: Maintenance & Repair

My check engine light is on and solid on my 2006 impala LT 3.9L V6. the
message center is telling me to tighten my gas cap... ive replaced gas cap 4
times now and got the car scanned for codes...got a P0455 so i replaced my
purge valve solenoid which is located on the top of the engine with no success
anything else that would cause this issue?

2 Answers

75

You need to smoke test the evap system to determine where the leak could be. It's the only way to isolate the problem component without replacing all the components of the system. The top two hits on identifix are the purge valve, which you already did, and the gas cap, which you already did. It could be the fuel tank pressure sensor, but without a smoke machine its jut guess work.

5 people found this helpful.
120

Hi my check engine light is on, the code is po449 I'm trying to figure out the part or sensor I need to fix the problem

12 people found this helpful.

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