P0111: Intake Air Temperature Sensor 1 Circuit Range/Performance Bank 1
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Yes - this rarely affects driveability, but economy and cold starts suffer slightly.
Symptoms
- Slightly rough cold start
- Small drop in fuel economy
- Check engine light with no felt symptom
Likely causes, most common first
- Intake air temperature sensor drifting out of range
- Sensor contaminated with oil from the crankcase vent
- Poor connection at the sensor
- Sensor reading heat-soaked air after shutdown
Read P0111 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P0111 is a rationality code rather than a circuit failure: the intake air temperature reading is inside its electrical range but does not agree with the other temperature data the computer has. A common trigger is an intake temperature that stays far away from coolant temperature after an overnight soak, when the two should be nearly equal.
On many engines the intake temperature sensor is built into the mass air flow sensor, so an oily film from the crankcase ventilation system slows both readings at once. Cleaning is worth trying before replacement, and if the MAF and IAT complaints appear together the combined part is the likely answer.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Owner reports mentioning P0111
“1st incident-parking car in a stall, car shuts off before parked. P0111 replace air temp sensor 2nd incident-exiting the freeway on a single lane just under 35mph engine shuts off, steering wheel locks right, apply brakes lightly, shift into neutral to turn wheel to pull on shoulder. P0300 and p0302 code. Dealer replace bank #2 cylinder head and necessary parts.(incident posted information) 3rd incident-merging on freeway up the hill, engine bogs and shuts off, was on far right lane pulled to side. Dealer says misfire on cylinder #6 with no dtc code, says ignition coil problem on #6. *tr”2011 Volkswagen Routan · Aug 2013 · 58,300 mi
Cars that report P0111 most often
Based on mentions of this code in NHTSA owner complaints.
Frequently asked questions
Can I drive with P0111?
Yes - this rarely affects driveability, but economy and cold starts suffer slightly.
How much does it cost to fix P0111?
Typical US repair costs range from $20 for the simplest fix (sensor cleaning) to $250 in the worst case. The right number depends on which cause your car has - see the causes list.
Related codes
The codes closest to P0111. They often appear together, and telling them apart is usually what narrows the diagnosis.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.