1999 jeep grandcherokee

SOURCE: my 1999 jeep grandcherokee power windows are not

Check the fuses for both of those accessories. The A/C compressor usually has a fuse/relay under the hood as well.

SOURCE: 98 jeep grandcherokee code PO138,

P0138 - O2 Sensor Circuit High Voltage Bank 1 Sensor 2

The rear heated oxygen sensor (or sensor 2), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

Causes:
- Harness or connectors (The sensor circuit is open or shorted)
- Rear heated oxygen sensor (Bank 1) may be faulty

Solutions:
Replacing the O2 Sensor 2 usually takes care of the problem


P0141 - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 2

Causes:
- Harness or connectors (The sensor circuit is open or shorted)
- Rear heated oxygen sensor (Bank 1) may be faulty

Solutions:
Replacing the O2 Sensor 2 usually takes care of the problem


P0463 - Fuel Level Sensor Circuit High Input

The fuel level sensor is mounted in the fuel level sensor unit. The sensor detects a fuel level in the fuel tank and transmits a signal to the ECM or PCM, It consists of two parts, one is mechanical float and the other side is variable resistor. Fuel level sensor output voltage changes depending on the movement of the fuel mechanical float.

Causes:
- Fuel level sensor circuit harness or connectors is open or shorted
- Fuel level sensor may be faulty

Solutions:
Replaced fuel level sensor.

Iron

• 3018 Answers
• Posted on May 03, 2011

SOURCE: what does this codes mean?

• Code 15 - Is a defective speed sensor or the power feed to it has been interrupted or a wire that connects to the ECM could be old and need replacing. This will require some diagnosing with a multi meter. It will take some time but is necessary. The Speed Sensor for a 2 wheel drive is located at the rear of the transmission on the tailshaft. On a 4 wheel drive it's located on the back of the transfer case.

• Code 33 - You have a bad wire going to the AC clutch. Possible AC clutch relay issue.

Chris Harvey

• 447 Answers
• Posted on Aug 03, 2011

SOURCE: i unplugged my battery on

have you checked the fuses /relays/wireing sometimes when you disconect and reconedt a battery you can get a power surge