I have a 04 buick ranier just purchased it no codes but it won't pass PA emissions did a scan for codes there are none but the scan shows that the pending light is on steady what's the most commo

Asked by Aug 13, 2015 at 03:38 PM about the 2004 Buick Rainier CXL AWD

Question type: Maintenance & Repair

1 Answer

78,545

O2 sensors and the TPS seem to be the most common failures. I would recommend that you have the system "live data" scanned, that way you can actually see what the ECM is reading from each sensor and it will shoe any sensors that might be out of specs but not enough to turn on the check engine light.

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