
1991 Geo Prizm GSi 1.6L MIL Lamp on
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...
Summary posted 3/16/2005
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Message Closed w/Summary
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VIN | 1Y1SL5450M |
Engine | 1.6 L / 4 cyl / GAS |
Trans | 4-speed Automatic |
Delivery | FI |
Emissions | Fed |
Symptoms | MIL Lamp On |
Occurs | Always |
Misc. | 4Age Toyota Engine, Federal Emissions |
Trouble Codes
21 | oxygen sensor circuit/open or short circuit |
Message Closed w/Summary
Vehicle Data
1991 Geo Prizm GSi
VIN | 1Y1SL5450M |
Engine | 1.6 L / 4 cyl / GAS |
Trans | 4-speed Automatic |
Delivery | FI |
Emissions | Fed |
Symptoms | MIL Lamp On |
Occurs | Always |
Misc. | 4Age Toyota Engine, Federal Emissions |
Trouble Codes
21 | oxygen sensor circuit/open or short circuit |