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Re: dtc 171 174
I only posted the tsb to help if all else failed.
Before you get into the TSB check out the things DRW1000 outlined in upper post.
Check fuel filter and fuel pressure and fuel reg. mass air flow sensor pcv valve and watch the fuel trims on a scanner or anything that can make it run lean.
Is the code stored in memory are they hard codes?
I think the tsb only refers to codes stored in memory.
MT
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