Code 51

BUDDHALUV79

MEMBER
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!

1 Reply

DJCL

MECHANIC
767 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.