What P0113 means
The intake air temperature sensor tells the computer how dense the incoming air is. P0113 means its circuit reads impossibly high resistance — the electrical signature of a disconnected or broken sensor, which the computer interprets as absurdly hot intake air.
What you’ll notice
- Check engine light
- Often no drivability change at all
- Sometimes slightly worse economy or hesitation on cold mornings
Likely causes and repair cost
Broad US independent-shop bands, parts and labour.
Can you drive with P0113?
Yes — the computer substitutes a default temperature and the engine runs close to normally. Fix at your convenience, before it costs you an emissions test.
The misdiagnosis to avoid
Overpaying when the IAT is integrated into the MAF sensor: on many engines it's one combined part, and a shop may quote the full MAF for what began as a $5 connector repair. Ask whether your IAT is standalone or integrated, and whether the wiring was tested first.
How P0113 actually gets set
These codes report an electrical condition, not a mechanical failure. The computer expects a signal within a defined voltage or frequency range; when the reading sits outside that range, is implausible against other sensors, or stops changing when it should, a circuit code sets. The distinction matters because the wording usually names a component while the fault is often in the wiring to it.
What a scan tool shows that the code does not
The live value from the sensor, compared against a known-good reading and against what the other sensors imply. A coolant temperature sensor reporting -40°C on a warm engine is reporting an open circuit, not a cold engine. That distinction is invisible in the code and obvious in live data.
The trap with this family of codes
Replacing the named sensor. A circuit code names where the computer noticed the problem, not where the problem is. Corroded connectors, chafed harness sections and bad grounds produce identical codes, and a new sensor plugged into a damaged circuit fails exactly the same way.
What happens when you clear it
Circuit monitors generally run continuously, so these codes return almost immediately if the fault is still present — which makes them easy to verify a repair against.
Depends entirely on which sensor. A failed coolant temperature sensor can make the engine run rich indefinitely; a failed ambient air temperature sensor affects almost nothing. The rule is to look at what the computer does with that reading, not at the code's severity label.
Describe what it’s doing in your own words and the symptom checker gives you a safe-to-drive verdict, ranked causes with costs, and notes to take to the shop — free, no sign-up.
A basic code reader costs around $25 and usually pays for itself the first time a warning light comes on. We compare them in choosing an OBD2 scanner.
Questions people ask
Why did this appear right after an air filter change?
Because the sensor or its connector lives in the intake tract that just got handled — the connector gets tugged loose or the clip breaks. A P0113 within days of filter service is a reseat-the-plug situation more often than a failure.
Is this related to hard cold starts?
It can be — the temperature reading shapes cold-start fuelling, and a defaulted value tuned for moderate weather starts poorly in real cold. If cold-morning starting worsened alongside the code, fixing this cheap sensor is likely your cure.