Question about 1999 Chevrolet Cavalier
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
That is your O2 sensor that has gone bad or the wire harness gone bad. The O2 sensor is along your exhaust system from the exhaust manifold before the Catalytic Converter. It's a simple fix and you can replace it your self with common tools. If you go to Auto Zone your can pick up the O2 sensor there and they can give you the step by step instructions to replacing the O2 sensor with common tools. Good luck and keep me posted. Don't for get to inspect the wire harness for damages and the check engine light should go off after the third start up with out any issues once the issue has been addressed and after 100 start cycle, the DTC code will be erased from the history.
Posted on Jul 28, 2009
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Posted on Jan 02, 2017
SOURCE: check engine light code P0171
That code is a good O2 sensor reporting a lean condition. Lazy people and part stored just say it is the O2 sensor because they don't know how to fix it. Bank 1 is the side of the engine with the number one cylinder. That bank has a lean condition meaning it doesn't have enough fuel for the given amount of air. Since this is only affecting one side of the engine, that narrows down possible causes. Possible causes would a leaking intake gasket or a broken vacuum hose on that side. Since both sides get fuel from the same pump and rail, this wouldn't be a fuel pump or regulator issue. It can, however, be an indication of a bad fuel injector on that side of the engine. The MAP sensor also couldn't cause this code because, just like the fuel pump, that MAP sensor works for both sides of the engine and the code is only for one side. I would drive it for a couple more days to see if you get any additional codes that could help point you towards the actual problem. In the meantime, I would check for vacuum leaks (look at the rubber hoses and listen for high pitch hissing or sucking sounds.)
Posted on Mar 03, 2011
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