P0112
IAT Sensor Circuit Low Input
low
i Description
The Intake Air Temperature sensor is reporting an implausibly low voltage, indicating an extremely high temperature reading. Since the IAT is a thermistor with inverse resistance, low voltage means the ECU is seeing very high intake air temperature.
? Common Causes
- Short circuit in IAT wiring
- Faulty IAT sensor
- Sensor located too close to heat source
- Corroded connector
! Symptoms
- Check engine light
- Slightly lean fuel mixture
- Minor performance decrease
# Diagnostic Steps
- Test IAT sensor resistance at known temperature
- Check for short circuits in wiring
- Inspect sensor location for heat sources
- Replace sensor if resistance is out of spec
⚙ Typical Fix
Replace the IAT sensor or repair shorted wiring.
Parts Needed
IAT sensor
Estimated Cost
$30-$150
↔ Related Codes
Q Frequently Asked Questions
Yes. The ECU will compensate, but fuel mixture may be slightly off. Fix at your convenience.
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