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2004 Chevy avalanche p0171, p0134

  

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Hey Scotty, i recently bought a 2004 Chevy avalanche with 54000 miles on it, i thought i got a good deal until after s friend punted or that it looked like it was crashed at some point. it has a p0171 and p0134 on it. The p0134 is for an oxygen sensor that i replaced but says it isn't detecting it. World the p0171 code (lean condition) be a side effect of the oxygen sensor not being detected or should I keep looking for vacuum leaks? Thank you!


1 Answer
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P0171 means that your engine is running too lean.

P0134 means that your engine is running too rich.

I would check for vacuum leaks. I would also check the MAF sensor, the EGR system and fuel injectors. 


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