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2001 KIA OPTIMA
2.4L I4•FWD•AUTOMATIC•gas
3 active safety recalls on this vehicle — view recalls
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Repairs0Labor547Torque3395Fluid6DTC678Battery1Maintenance0Recalls3
P1112low severityPowertrain

Intake Air Temperature Sensor Circuit High/Intermittent

on 2001 Kia Optima 2.4L I4 · FWD

What this code means

The PCM has detected an intermittent high-voltage condition on the Intake Air Temperature sensor circuit. The signal intermittently spikes above normal range, indicating a possible open circuit condition.

Symptoms

  • Check Engine Light
  • Engine may run slightly rich during fault
  • Minor performance variation

Common causes

  • Loose IAT sensor connector causing open circuit
  • Damaged IAT sensor wiring
  • Corroded connector pins
  • Failing IAT sensor with increasing resistance

Diagnostic steps

  1. Monitor IAT voltage on scan tool and wiggle test connections
  2. Inspect connector for loose or spread pins
  3. Test IAT sensor resistance and compare to specification
  4. Check wiring for high-resistance connections

Repair notes

Repair connector or wiring; replace the IAT sensor if resistance is out of specification.

Other Powertrain codes on this vehicle

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