P0110low severityPowertrain
Intake Air Temperature (IAT) Sensor 1 Circuit
on 2009 Subaru Legacy 2.5L H4 · AWD
What this code means
General malfunction in the intake air temperature sensor circuit.
Symptoms
- Check Engine Light
- Poor fuel economy
- Hard starting in cold weather
- Incorrect idle speed
Common causes
- Faulty IAT sensor
- Wiring issue
- Corroded connector
- Sensor contaminated
Diagnostic steps
- Test IAT sensor resistance at known temperature
- Inspect wiring and connector
- Compare IAT reading to ECT at cold start
Repair notes
Replace IAT sensor or repair wiring.
Other Powertrain codes on this vehicle
P0001
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P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
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P0004
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P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1