2004 Jeep Grand Cherokee Laredo 4.0L MIL Lamp on
After the light is cleared and the vehicle is started the light comes right back on immediately. Hard code. Was told that the PCM might have to be flashed. Not sure though. Also was told there may be a possible short to ground.
FIX posted 3/30/2011
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Vehicle Data2004 Jeep Grand Cherokee Laredo
Trouble Codes
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Vehicle Data
2004 Jeep Grand Cherokee Laredo
VIN | 1J4GW48SX4 |
Engine | 4.0 L / 6 cyl / GAS |
Trans | 4-speed Automatic (Electronic) |
Delivery | Fuel Injection |
Emissions | OBD-II Compliant |
Symptoms | MIL Lamp On |
Occurs | Always |
Trouble Codes
P0031 | Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Low Voltage |
P0135 | Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Malfunction |