Code 51

1995 DODGE STRATUS
200,000 MILES • 4 CYL • AUTOMATIC
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BUDDHALUV79
  • MEMBER
  • 42 POSTS
The car has started giving a "Code 51"...Oxygen Sensor signal input indicates lean fuel/air ratio conditioned during engine operation.

Any help on what might be causing this or what I could check to correct it would be greatly appreciated.

Thanks so much!!
Mar 29, 2012 at 3:35 PM
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DJCL
  • ✓ASE Certified Mechanic
  • 767 POSTS
  • ASE Certified Mechanic
How is the car running ? I would first test the o2 sensor. Monitor the signal wire with a lab scope or scanner add fuel check and see of your voltage rises up to 900 mv then give it a large vacuum leak to see if it drops close to 0 mv. This will tell us if the o2 is working and can be trusted.
Mar 29, 2012 at 4:53 PM
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