Having problems with your 1999 Chevrolet Cavalier ?
Po171 error code
\015 My check engine light cam on got error code po 171 on my 1999 ford f150 6cydl 4.2\015
P0171 means the system is lean on cylinder bank number one, with just the one code you could replace the bank one upstream O2 sensor and that will most likely cure the problem.
Repair Help & Product Troubleshooting for 1999 Chevrolet Cavalier
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