Showing codes PO171 bank 1 too lean

Tiny
RICHARD1983
  • 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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Thursday, June 21st, 2012 AT 5:22 PM

1 Reply

Tiny
KHLOW2008
  • EXPERT
  • 41,975 POSTS

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.

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Thursday, June 21st, 2012 AT 5:45 PM

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