Question about 2008 Chevrolet Trailblazer
Installed 400w car amp. Upon starting, Check engine light came on. Code P0171 was what i got.
Uninstall the amp as you plugged into a circuit that is incorrect and is affecting the power supply to ---fuel pump---AIR system---MAF/VAF sensor--
Posted on Dec 27, 2013
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Posted on Jan 02, 2017
This is probably referring to problems with your bank 1 oxygen sensor. Without the vehicle make, model and year I can't tell you where it is located. However, if you replace your front oxygen sensor that should clear up the problem. Also, if you do replace it, I always run some fuel injector cleaner through a full tank of gas at the same time. Hope this helps!
Posted on May 17, 2009
oxygen sensor, vacuum leak, and yes it could most definitly be if you swaped the wires of the firing order accidently you will get a code p0171 Check the tubing going from the air filter to the intake manifold to see if it has come loose. This might account for extra air going into the intake manifold than the computer is aware of. Otherwise it may be due to a faulty(or dirty) MAP/MAF sensor. Another possible cause is from low fuel pressure due to restricted fuel lines or a bad fuel pump.
Posted on Jul 28, 2009
Code P0171 is a lean oxygen sensor code for bank 1 on your engine. Bank 1 is always the side of the engine where #1 cylider is located.
There are a couple of Technical Service Bulletins (TSB's) that may apply to your problem.
Bulletin No.: 09-06-03-004C
This bulletin covers intermittent problems due to oxidation problems in some of the wiring connectors.
Bulletin No.: 03-06-04-030G
This bulletin outlines repair proceedures for clogged or restricted fuel injectors.
The only other thing I can think of would be a vacuum leak that occurs only in cold ambient temperatures and only affects bank 1. (possible intake manifold gasket or something similar.)
Posted on Dec 19, 2010
SOURCE: engine code p0133, p0134, p1133,
All those codes and such an easy fix. ALL of these codes point to your upstream 02 sensor. It's the one on the passenger side of the engine coming off the exhaust, very very easy to get to. Soak that puppy with PB Blaster then remove the electrical connector and remove and replace sensor. TRY to stay away from Bosch 02 sensors, have been known and reported problems with these. In my case, I didn't have a choice but to buy the Bosch, but I haven't had any problems with mine.
Hope this helps, look to get a tad more miles per gallon too.
Posted on May 27, 2011
Testimonial: "Good answer and really appreciate the help. Also was told a PCM recalibration may be needed. Thanks"
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System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
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