I found that a 401 engine code is cause by a expected change in the air fuel mixture not happening. What generally causes this engine warning and is it something I can fix. I can fix most anything that doesn't require specialty tools.
What causes a 401 engine code on a 2001 PT Cruiser?
p0401 is egr system failure. the egr vavlve most likely needs to be replaced. check the vacuum to the solenoid first. if it is ok, you need a new valve/solenoid assembly.
Reply:i have found that the most common cause of this code is a weak o2 sensor in the exhaust if you have not replaced this i would put a new one in they are in my opinion a maintenance item like spark plug look up near the manifold it kind of looks like a spark plug with a wire harness coming out of it.change this clear the code and see if it cures the problem if not you might have to take it to a garage to have it diagnosed good luck
flowers for algernon
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