P0171 system too lean bank 1

dlnelsonroca

Active Member
Hello! My Trailblazer has given me the code P0171 off and on for a few months now. The odd symptom that I'm hoping you can help me diagnose is that it comes on for a few days, then goes off for a day or half a day, and then on again, repeatedly. I've looked for a vacuum leak without success. What do you think? Thanks!
 
OP
OP
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dlnelsonroca

Active Member
Thanks all! I'm going to check the intake manifold bolts as soon as I can. Hopefully that will take care of it. If not then I'll look at the Secondary Air Injection System. Yes, there's quite a bit of info about that here! My Trailbalzer is a 2004 LS extended version with 4x4, the inline six cylinder engine, and with about 140,000 miles on it now. I have a scanner, an Autolink AL539. I'm not sure if it reads live data or not, never having used that, and not really being a mechanic. I'm just too far from good mechanics to not try to do most work myself!

I just checked the scanner manual, and it does appear to do live data.
 

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