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1991 Ford Explorer 4.0L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on
Truck will run OK at idle emisions OK . drive truck at highway speeds fore about 5 miles system goes in open loop check engine light come on. Perform KOEO test no codes perform KOER test code 42. Go to data acrean O2 switching normal. Ihave check computer grou...
FIX posted 5/12/1999
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Message Closed w/FIX
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| VIN | [No VIN Available] |
| Engine | 4.0 L / 6 cyl |
| Emissions | U S fed emissions |
| Symptoms | Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp On |
| Occurs | Cruise, Intermittently |
Trouble Codes
| 42 | hego not switching rich al the time |
Message Closed w/FIX
Vehicle Data
1991 Ford Explorer
| VIN | [No VIN Available] |
| Engine | 4.0 L / 6 cyl |
| Emissions | U S fed emissions |
| Symptoms | Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp On |
| Occurs | Cruise, Intermittently |
Trouble Codes
| 42 | hego not switching rich al the time |
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