P0111

Intake Air Temperature Sensor 1 Circuit Range/Performance Bank 1

Fuel & air metering Generic OBD-II Low

What it means

P0111 means the intake air temperature (IAT) sensor's reading is out of its expected range or doesn't respond correctly as conditions change. The ECM uses air temperature to fine-tune fuel and timing. A skewed reading can slightly richen or lean the mixture, but on its own it has little effect on how the car actually drives.

Low

Can I keep driving? Yes — this is a minor sensor fault; the car drives normally, though cold-start behaviour and fuel economy may be slightly off until it's fixed.

Real-world scan data

Seen in

754

scans in the past year

Found in

0.1%

of scans

0.2%

of scans that found faults

Appears alongside · share of P0111 scans

P0071in 73.7% of scans

P007Bin 72.8% of scans

P0850in 72.4% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Slightly rough idle or minor hesitation
Reduced fuel economy
Air temperature reading on a scan tool that doesn't match ambient or coolant temp

Common causes

Most likely first

Faulty or lazy IAT sensor (often built into the MAF on many cars)Likely
Corroded or loose sensor connectorCommon
Damaged wiring in the sensor circuitCommon
Sensor contaminated by oil or dirt from the intakeLess often
Rarely, an ECM faultLess often

How to diagnose & fix

Work through it in order

Read live data and compare the IAT reading to coolant temp after the car has sat overnight — they should be close.
Inspect and clean the sensor and its connector.
Check the wiring for damage or corrosion.
Replace the IAT sensor (or combined MAF/IAT unit) if the reading stays out of range.
Clear the code and confirm the reading tracks correctly.

FAQ

Quick answers

Is it safe to drive with P0111?+

Yes. P0111 is a low-impact sensor fault that won't leave you stranded. It's worth fixing to keep fuel trims and cold starts correct, but it isn't urgent.

Can I just clear P0111?+

It may clear briefly, but if the sensor or wiring is at fault the code returns after the ECM re-checks the reading.

Read & clear P0111 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX