I have a service engine soon light and pulled the OBDII code P0171 with my scan tool. Can anyone direct me on what to check for this code.
Regards,
Eric
- posted
19 years ago
1997 GTP SES Code P0171
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- posted
19 years ago
If an excessively lean condition is detected, the PCM will set DTC P0171. You need to monitor the O2 sensors with a scan tool, and see if they are responding properly. The quick check for O2 response is to add propane at a vacuum line. It could be the 02 sensor is bad or it could be your injectors are excessively dirty, or you have a vacuum leak, or bad PCM grounds, or a bad MAF sensor, or low fuel pressure......or more. GW