Parts
$10–40 standalone / $80–300 integrated MAF
P0112 — Intake Air Temperature Sensor Circuit Low
SAFEIs it safe to drive? Safe to drive short-term, though fueling will be slightly off — address it within a few weeks.
What P0112 means
The intake-air-temp signal is stuck below the low-voltage threshold, which corresponds to an implausibly HOT intake-air reading. The ECU falls back to a fixed air-temperature value and keeps running, but fueling (slightly leaner) and cold-start enrichment can be affected.
Most likely causes (in order)
- IAT sensor signal wire shorted to ground
- Failed IAT sensor (internal short)
- Corroded or water-damaged connector
- On integrated MAF/IAT sensors, the MAF unit itself may need replacement ($80–300)
Symptoms you might notice
- Check engine light
- Slightly lean running or cold-start hesitation when cold
What to check first
Disconnect the IAT sensor — if the code goes away or the reading jumps to a high value, the sensor is shorted internally. If the low reading persists with the sensor disconnected, the signal wire is shorted to ground in the harness.
Repair cost & difficulty
Labor
0.2–0.5 hr
Difficulty
DIY-friendly