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1989 Ford Mustang GT 5.0L MIL Lamp on
Posted to Ford Driveability on 7/21/2013 11 Replies

Car runs fine. Fuel economy 19 city, 24 highway. No apparent signs of drivability accept for the codes. The main wiring harness was in bad shape and I replace it with a good used [...] thing works the way it should.

Any input would be appreciated.

11 Replies Received (View Replies)

  Related Documents & Media  1989 Ford Mustang GT

 
Message Closed w/Summary

car Vehicle Data

1989 Ford Mustang GT

VIN 1FABP42E4K
Engine5.0 L / 8 cyl / GAS
Trans5-speed Standard
DeliveryFuel Injection / SEFI
EmissionsOBD1
SymptomsMIL Lamp On

Trouble Codes

41HEGO sensor circut indicates system lean right side
91No HEGO switching detected always lean left side
Message Closed w/Summary

car Vehicle Data

1989 Ford Mustang GT

VIN 1FABP42E4K
Engine5.0 L / 8 cyl / GAS
Trans5-speed Standard
DeliveryFuel Injection / SEFI
EmissionsOBD1
SymptomsMIL Lamp On

Trouble Codes

41HEGO sensor circut indicates system lean right side
91No HEGO switching detected always lean left side