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Hey all, just finished cleaning my egr valve and trying to clear the p0401 code. How can you tell if that was the problem if the CEL remains lit. Is there a way to clear the CEL????? without a scanner. Auto zone got the code for me. The truck is an 03 basically stock just an exhaust. Also now when i stomp on it i get a small puff of black smoke that clears right up, but it never did it before. Thanks Brian...
 

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You need to get it on a good scanner. You can disconnect both batteries for 30 min and reconect them and that should clear the code.
 

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Thanks for the reply, and i should get my own scanner. I went to auto zone and they cleared it, so far no more cel so well see. Thanks Brian....
 
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