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Diagnose codes p0101, p0171, p0174, p0442 on 2004 chevy silverado 1500
2004 Chevrolet Silverado 1500

Diagnose Codes P0101, p0171, p0174, p0442 on 2004 Chevy Silverado 1500

(2004 Chevrolet Silverado 1500)
A few months ago the engine warning light came on and the codes were read as P0101, p0171, p0174, and
p0442. Performance-wise, the only symptoms that I have noticed are a slightly uneven idle. I removed and cleaned the MAF sensor using MAF cleaner. The codes went away until a few days ago. My code scanner indicates that the same codes are being flagged again. I am looking for suggestions on how I might systematically go about diagnosing what's going on. Thanks for your help!

Jon
What seems to make the problem better or worse? Unsure what makes the problem worse
How long have you had this problem? Twice within the last several months
Tags: chevrolet, silverado 1500
2 answers & 0 comments
Popular Answer
on November 19, 2018

https://www.engine-codes.com/
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General Diagnosis
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on November 19, 2018

https://www.engine-codes.com/
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on November 19, 2018
You very well could have a vacuum leak. Look around under the hood for broken or disconnected vacuum hoses or lines. The best way to check for leaks is with a smoke machine that most shops have.
If you don't normally work on cars then use this link to find a good shop near you.
https://repairpal.com/repair-shops
Alex
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