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1987 Ford LTD Crown Victoria LX 5.0L MIL Lamp on
What I need to know about this vehicle is why this code 91 keeps returning emediately after eng start? No wait for warm up or anything. I can clear code and recheck with the KOER self test and it will show up again even though I have replaced the O2 sensor and...
FIX posted 10/14/1998
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Related Documents & Media 
| VIN | 2FABP74FOH |
| Engine | 5.0 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / SEFI |
| Emissions | OBD I |
| Symptoms | MIL Lamp On |
| Occurs | Always, Right After Start |
| Misc. | Sefi, Eeciv |
Trouble Codes
| 61 | ECT sensor ckt prob |
| 85 | cnap-canister pruge ckt open or shorted |
| 91 | ho2s lean |
Message Closed w/FIX
Vehicle Data
1987 Ford LTD Crown Victoria LX
| VIN | 2FABP74FOH |
| Engine | 5.0 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / SEFI |
| Emissions | OBD I |
| Symptoms | MIL Lamp On |
| Occurs | Always, Right After Start |
| Misc. | Sefi, Eeciv |
Trouble Codes
| 61 | ECT sensor ckt prob |
| 85 | cnap-canister pruge ckt open or shorted |
| 91 | ho2s lean |
Video