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