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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?
Wiki User
∙ 18y ago
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.
Wiki User
∙ 18y ago
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