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Wiring harness rub
The wiring harness on the back of the cylinder head of the 4.0L engine can rub through on the head bolt studs causing O2 sensor heater codes. I imagine there could be other codes or problems caused by this also. I know about the O2 codes from personal experien... Login to read more. 
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| Engine | 4.0 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2004 Jeep Grand Cherokee Laredo 4.0L
| Engine | 4.0 L |
| Trans | 4-speed Automatic (Electronic) |
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