• Tiny
  • buddhaluv79
  • 1995 Dodge Stratus
  • 4 CYL
  • automatic
  • 200,000 miles

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!

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have the same problem?
Thursday, March 29th, 2012 AT 3:35 PM

1 Reply

  • Tiny
  • djcl
  • Expert
  • 786 posts

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.

Was this
Thursday, March 29th, 2012 AT 4:53 PM

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