P1112low severityPowertrain
Intake Air Temperature Sensor Circuit High/Intermittent
on 2006 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
- Monitor IAT voltage on scan tool and wiggle test connections
- Inspect connector for loose or spread pins
- Test IAT sensor resistance and compare to specification
- Check wiring for high-resistance connections
Repair notes
Repair connector or wiring; replace the IAT sensor if resistance is out of specification.
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