P0110 fault code: Intake Air Temperature Sensor 1 Circuit

P0110 means “Intake Air Temperature Sensor 1 Circuit” — a fuel and air metering fault in the powertrain.

Can I DIY?

Professional-only boundary. Confirm P0110 on a scan; IAT sensor 1 circuit repair is professional on this page.

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 P0110

Do not drive. Intake air temperature sensor 1 has a circuit fault, so the main incoming-air temperature used for cold-start fuelling may be untrusted.

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: Registration number
  • Intake Air Temperature Sensor 1 Circuit: Exact code P0110 and any P0111–P0114 or coolant-temp codes
  • Intake Air Temperature Sensor 1 Circuit: Whether the problem is worse on a cold morning
  • Intake Air Temperature Sensor 1 Circuit: Whether the air-filter box or MAF housing was recently opened
P01xxFuel and air metering
MOT fail riskif the warning light stays on

What does P0110 mean?

P0110 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”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0110 fail an MOT?

An illuminated engine management light is a Major defect at MOT until the fault is repaired and the lamp stays off. P0110 is the primary intake-air temperature circuit, not an MOT weather reading.

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

P0110 — quick answers

Is it safe to drive with P0110?

Do not drive. We have no verified driving guidance for P0110 — treat as do not drive until checked. Sensor 1 is not copied from the graded P0113 neighbour row.

Will P0110 fail my MOT?

An illuminated engine management light is a Major defect at MOT until the fault is repaired and the lamp stays off. P0110 is the primary intake-air temperature circuit, not an MOT weather reading.

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.