Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
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JDL
CAR REPAIR CONTRIBUTOR
16,098 POSTS
It means bank one is running lean according to 02 sensor. How long since a tune-up? 02 sensors are part of a tune-up. Some other possibilities, fuel issue--vacuum leak, Im sure there are other possible causes.