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2002 KIA OPTIMA
2.4L I4•FWD•AUTOMATIC•gas
3 active safety recalls on this vehicle — view recalls
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Repairs0Labor494Torque3136Fluid7DTC870Battery1Maintenance0Recalls3
P1151high severityPowertrain

Accelerator Pedal Position Sensor 2 Circuit Malfunction

on 2002 Kia Optima 2.4L I4 · FWD

What this code means

The PCM has detected a malfunction in the Accelerator Pedal Position Sensor 2 circuit. This redundant sensor provides a backup throttle demand signal for safety. A fault in either APP sensor triggers reduced power mode.

Symptoms

  • Check Engine Light
  • Reduced power mode activated
  • Engine limited to low RPM
  • ETC warning light on
  • Slow throttle response

Common causes

  • Faulty APP sensor 2
  • Wiring or connector issue in APP sensor 2 circuit
  • Corroded accelerator pedal connector
  • Failing accelerator pedal assembly
  • Reference voltage issue

Diagnostic steps

  1. Monitor APP sensor 2 voltage through full pedal travel
  2. Compare APP sensor 2 with APP sensor 1 readings
  3. Inspect accelerator pedal connector for corrosion
  4. Check reference voltage at APP sensor 2
  5. Wiggle test wiring while monitoring

Repair notes

Replace the accelerator pedal assembly if the APP sensor 2 is faulty.

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