Pontiac Problems? Ask a Mechanic for Answers ASAP
Hi Im David thanks for using the site, allow me a moment to look up some info for you. thanks
P0171 PONTIAC - Fuel Trim System Lean Bank 1Possible causes - Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connectionIf the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced. The P0171 code could also be caused may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure or Engine Control Temperature (ECT) Sensor reading inaccurate.
no i dont think the o2 sensor will cause this.
i do believe that the tsb provided needs to be complied with by the dealer. its specifically for your vehicle and code that you are getting.
yes. i just explained that. and my opinion is leaky fuel injectors.
not hold accumulated pressure for immediate start up
you can try to clean the throttlebody plate, the egr and the iac to see if that helps.
ok ...keep me posted.
do you still need assistance?
I believe That I can help you fix this problem. Would you like to work with me to find and fix this?