Chevrolet Q&A

Ask Your Question

2006 Chevrolet Trailblazer Question: PO171 OBSII Code keeps coming up

 

Question

PDWILK, Graham, NC, January 06, 2011, 05:57
 Rookie

Check engine light on, PO171 Code indicates running lean. No performance problems, no change in gas mileage, not running rough, no delayed start. Replaced Oxygen Sensor bank 1, cleaned mass air flow sensor, sprayed intake manifold with carb cleaner to check for leaks (no change in idle or performance). Considering PCM reprogramming at GM dealer. Any suggestions?

1 Answer
Flag This
  • Answer #1

    January 06, 2011, 06:45
    Profile_thumbnail
     Master

    I'd check fuel pressure and if all vacuum hoses are attached to the intake, no cracks on them. Also check the intake manifold for leaks with a smoke pump.
    I'd get a professional fuel injector cleaning also. Beside the MAF sensor the dirty injectors are commonly setting P0171 lean codes on GM vehicles.

    Zee

    Reply
    Flag This