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2000 Chevrolet Silverado 1500

Question: How to reset or repair OBD Codes 171 & 174 System too lean Bank 1 and Bank 2

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ejmoody, 4.8L V8, Westminster, CA, August 10, 2011, 04:29
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 Rookie

I can clear the service engine soon light but it comes right back. What does sytem too lean actually mean?

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  • Answer #1

    mastertech6371 August 10, 2011, 06:23
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     Master

    clearing never fixes a problem. your long term trims are too high. there is many reasons. vacuum leak, pcv valve, mass air flow sensor, low fuel pressure. all these need to be checked and verified.

    Roy

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