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What is po401?

Updated: 10/21/2022
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10y ago

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You lucked out-it's just a bad egr valve.

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10y ago
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Q: What is po401?
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What is code PO401 on 2003 Hyundai?

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What should you do changed egr valve turned off engine light but code po401 returns please help it is a 1998 Monte Carlo?

i need to no what kind of car if it is a ford change tube and check intake hole under egr Yoah, Rob, it's a 1998 CHEVROLET Monte Carlo, says so in the question. A PO401 code doesn't usually mean there is a malfunction in the EGR valve. It often means there is an electrical problem with the EGR to PCM circuit or other sensors. If you have a scanner you can run a complete diagnostic yourself. If not, you will need a garage or dealer to run it for you.


What the problem about po401?

The code means EGR Insufficient Flow. This does NOT necessarily mean that the EGR needs to be replaced, but there is a problem with it. Take it to a respectable mechanic and have your car tested. Only a service professional who is inspecting your car will know what exactly needs to be replaced.