Mechanics

SHOWING CODES PO171 BANK 1 TOO LEAN

2003 GMC Sierra • 240,000 miles

03 gmc sierra 5.3, po300 random/multiple misfire, pulled plugs and drivers side plugs are black like theyre not firing, passenger side plugs were tan. If drivers side is not firing due to o2 sensor can I change both o2 on driver side to fix issue.

if bank 1 too lean and drivers side plugs not firing, can I change both o2 sensors on drivers side to fix issue?
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Richard1983
June 21, 2012.




If the plugs are not firing, the O2 sensor would not help. You need to find out what is causing the non firing. It could be something else that is wrong.

KHLow2008
Jun 21, 2012.


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