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1991 Geo Prizm GSi 1.6L MIL Lamp on
Posted to GM Driveability on 3/1/2005 5 Replies

Vehicle came to us with the cooling fans running all the time,the transmission would downshift at highway speeds when the temp. guage would drop. Found a broken wire between the the cooling fan thermal switch and the relay. repaired the wire and the cooling fa...

5 Replies Received (View Replies)

  Related Documents & Media  1991 Geo Prizm GSi

 
Message Closed w/Summary

car Vehicle Data

1991 Geo Prizm GSi

VIN 1Y1SL5450M
Engine1.6 L / 4 cyl / GAS
Trans4-speed Automatic
DeliveryFI
EmissionsFed
SymptomsMIL Lamp On
OccursAlways
Misc.4Age Toyota Engine, Federal Emissions

Trouble Codes

21oxygen sensor circuit/open or short circuit
Message Closed w/Summary

car Vehicle Data

1991 Geo Prizm GSi

VIN 1Y1SL5450M
Engine1.6 L / 4 cyl / GAS
Trans4-speed Automatic
DeliveryFI
EmissionsFed
SymptomsMIL Lamp On
OccursAlways
Misc.4Age Toyota Engine, Federal Emissions

Trouble Codes

21oxygen sensor circuit/open or short circuit