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1991 Ford Explorer XL 4.0L Excessive Emissions, Poor Fuel Economy, MIL Lamp on
Hi Guys, Dont know how I inhearted this one, OH well. This truck wont hold closed loop, It will go on it & then in a couple minutes will open back up & not go back in closed loop operation. I found thAT there was nokey power to the HEGO & now have batt voltage...
FIX posted 8/6/1998
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Related Documents & Media 
| VIN | 1FMDU34X4M |
| Engine | 4.0 L / 6 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / EFI |
| Emissions | US FED |
| Symptoms | Excessive Emissions, Poor Fuel Economy, MIL Lamp On |
| Occurs | Always |
Trouble Codes
| 41 | this is a continous code EGO not switching rich/lean |
| 42 | this is a KOER code EGO indicates sys. always rich |
Message Closed w/FIX
Vehicle Data
1991 Ford Explorer XL
| VIN | 1FMDU34X4M |
| Engine | 4.0 L / 6 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / EFI |
| Emissions | US FED |
| Symptoms | Excessive Emissions, Poor Fuel Economy, MIL Lamp On |
| Occurs | Always |
Trouble Codes
| 41 | this is a continous code EGO not switching rich/lean |
| 42 | this is a KOER code EGO indicates sys. always rich |
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