P0111 fault code: Intake Air Temperature Sensor 1 Circuit Range/Performance

P0111 means “Intake Air Temperature Sensor 1 Circuit Range/Performance” — a fuel and air metering fault in the powertrain.

Can I DIY?

Professional-only boundary. Read P0111; performance of IAT sensor 1 is not a driveway replace-by-guess.

Do not DIYReviewed page boundary
ToolsSpecialist equipment

This is the conservative boundary from the reviewed code record. This page has no frozen site-wide safety grade, so it does not publish a repair route.

What to tell the garage about P0111

Do not drive. The first intake-air temperature sensor is out of range or disagrees with expected warm-up, so the computer has marked its performance as wrong.

Take these reviewed, code-specific details with you. They help the garage confirm the fault without turning this page into a repair procedure.

  • Intake Air Temperature Sensor 1 Circuit Range/Performance: Registration number
  • Intake Air Temperature Sensor 1 Circuit Range/Performance: Exact code P0111 and freeze-frame intake-air temperature if shown
  • Intake Air Temperature Sensor 1 Circuit Range/Performance: How long the engine had been running when the light came on
  • Intake Air Temperature Sensor 1 Circuit Range/Performance: Companion MAF or coolant-temperature codes
P01xxFuel and air metering
MOT fail riskif the warning light stays on

What does P0111 mean?

P0111 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P01xx block, which covers fuel and air metering. The stored description is “Intake Air Temperature Sensor 1 Circuit Range/Performance”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0111 fail an MOT?

An illuminated engine management light is a Major defect at MOT until repaired and the lamp stays off. P0111 is a performance flag on intake-air temperature sensor 1, not an MOT temperature test.

Before booking your test, check what usually fails on your car: see our MOT pass rates by make and model, built from 33.1 million DVSA tests.

Related guides

Car diagnostic test cost: compare the scopeUK booking marketplaces currently publish diagnostic averages of about £52–£65. Engine management light on: steady or flashing?A steady engine management light means the computer has stored a fault. Drive with caution and get the code read. A flashing light is different — stop when it is safe.
P0100Mass or Volume Air Flow Circuit P0101Mass or Volume Air Flow Circuit Range/Performance P0102Mass or Volume Air Flow Circuit Low Input P0103Mass or Volume Air Flow Circuit High Input P0104Mass or Volume Air Flow Circuit Intermittent P0105Manifold Absolute Pressure/Barometric Pressure Circuit P0106Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance P0107Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

P0111 — quick answers

Is it safe to drive with P0111?

Do not drive. We have no verified driving guidance for P0111 — treat as do not drive until checked. Range/performance is not a parts list; it does not tell you to buy a sensor today.

Will P0111 fail my MOT?

An illuminated engine management light is a Major defect at MOT until repaired and the lamp stays off. P0111 is a performance flag on intake-air temperature sensor 1, not an MOT temperature test.

Fault-code identifiers are standard diagnostic facts. Their explanations and diagnostic guidance on this site are original editorial summaries, not reproduced SAE wording. MOT defect rules reflect the DVSA MOT inspection manual (2026). This page is general guidance for UK drivers, not a substitute for a professional diagnosis.