P0110 — Intake Air Temperature Sensor 1 Circuit
Low severityWhat it means
P0110 is stored when the engine control unit sees a fault involving the intake air temperature (IAT) sensor signal. The IAT sensor tells the control unit how warm the incoming air is, which fine-tunes fuelling and ignition timing, especially on cold starts. The control unit has flagged this circuit or signal as outside its normal operating range.
Common symptoms
- Poor fuel economy
- Rough running on cold starts
- Minor hesitation in some cases
Likely causes
- A wiring, connector or ground problem in the circuit
- A failed sensor or actuator in the circuit
- Faulty IAT sensor (often built into the MAF)
- Corroded or damaged sensor connector
What to check first
- Inspect the connector and wiring for damage, corrosion or loose pins
- On a cold engine, IAT should match coolant and ambient temperature in live data
- Inspect the connector and pins
Can you keep driving?
Safe to drive; only fuel economy and cold running suffer until repaired, and it is usually a cheap fix.
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