Hi. My car was running fine and the check engine
light came on and it was code P0171(MAF) so
then I cleaned the throttle body and now when I
start the car it sounds loud rough and when I try to
use the brake to stop it jerks. When I got up this
morning to start the car the battery was on. What
could be the problem?my car failed emissions
because of the P0171 and I tried to fix it but it
seems like I made it worse. Please help
P0171 CHEVROLET - Fuel Trim System Lean Bank 1... Possible 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 connection... Some Tech notes... If 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.
I just changed the intake last year. There's nothing leaking that I can see. When I got the check engine light codes it read P0010 and P0171 so after cleaning the throttle body the next code was P1400 and that was the only code. I will see if the 02 oxygen sensor fixes the problem.
I don't see a p1400 listing for Chevrolet.
P0171, you won't see it , buy might hear it. You can perform a smoke test on your system to see where it is leaking. Can be a split hose or gasket anywhere on the engine/intake past the MAF.
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