P0123 2002 JEEP LIBERTY - Throttle Position Sensor/Accelerator Position Pedal Circuit High Input Read more: https://www.autocodes.com/p0123_2002_jeep_liberty.html
P0121 2002 JEEP LIBERTY - Throttle Position Sensor 1 Performance Read more: https://www.autocodes.com/p0121_2002_jeep_liberty.html
Both codes are for the Thorttle Position Sensor (TPS). You probably have to replaced the sensor.
36.2k questions
32.2k answers
1.3k comments
22.8k users