1991 Jeep Wrangler P0121 Fault Code Check

When you check 1991 Jeep Wrangler car engine light came on code P0121 the reason should be Engine Light ON (or Service Engine Soon Warning Light). However Jeep manufacturer may have a different definition for the P0121 OBD-II Diagnostic Powertrain (P) Trouble Code. So you should chech it on our car models.

On 1999 and later P0121 1991 1991 Jeep Wrangler engines, the instrument cluster has a built-in self-diagnostic mode that can be accessed by pressing and holding the instrument cluster SELECT/RESET button. Insert the ignition key and turn to the RUN position (but don't crank or start engine). Continue to press and hold the SELECT/RESET button (for 5 seconds) until the word TEST is displayed by the odometer. Release the SELECT/RESET button within three seconds after the word TEST is displayed to begin the self-diagnostic mode.

1991 Jeep Wrangler P0121 OBD-II Diagnostic Powertrain (P) Trouble Code Description 1991 Jeep Wrangler car P0121 OBD-II Trouble Code The throttle position sensor ( Reason For 1991 Jeep Wrangler P0121 Code The reason of 1991 Jeep Wrangler P0121 OBD-II Fault Code Check is P0121 Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance.

1991 Jeep Wrangler P0121 Possibble Fix Ways :

There could be a number of reasons for noisy brakes. It could be that your brake pads are loose, worn out, or you may have brake dust inside the drum. If you can't see anything wrong with your brake pads, and you suspect it may be brake dust, it may be best to leave this to a professional, brake dust can be extremely dangerous if accidentally inhaled.

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0121 1991 1991 Jeep Wrangler code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.

What does fault code P0121 mean for 1991 Jeep Wrangler ? What does a diagnostic reading P0121 mean for 1991 Jeep Wrangler ? How to fix OBD2 Code P0121 for 1991 Jeep Wrangler ? What do we know about P0121 code for 1991 Jeep Wrangler ?