P0127 fault code: Intake Air Temperature Too High

P0127 means “Intake Air Temperature Too High” — a fuel and air metering fault in the powertrain.

Can I DIY?

Professional-only boundary. Confirm P0127; chasing a hot intake-air reading in a hot bay is garage work.

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 P0127

Do not drive. Incoming air is hotter than the computer allows. That is an air-temperature limit, not a coolant-overheat warning on its own — but a red coolant gauge is still a reason to stop.

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 Too High: Registration number
  • Intake Air Temperature Too High: Exact code P0127 and whether it set after a hard run, towing, or sitting in traffic
  • Intake Air Temperature Too High: Where the coolant gauge sat at the same moment
  • Intake Air Temperature Too High: Companion IAT or boost codes from the same scan
P01xxFuel and air metering
MOT fail riskif the warning light stays on

What does P0127 mean?

P0127 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 Too High”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0127 fail an MOT?

An illuminated engine management light is a Major defect at MOT until the fault is repaired and the lamp stays off. P0127 is an intake-air too-hot flag, not an MOT under-bonnet heat advisory.

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

P0127 — quick answers

Is it safe to drive with P0127?

Do not drive. We have no verified driving guidance for P0127 — treat as do not drive until checked. Hot intake air is not a cue to keep driving 'until it cools', and it is not a coolant-cap job.

Will P0127 fail my MOT?

An illuminated engine management light is a Major defect at MOT until the fault is repaired and the lamp stays off. P0127 is an intake-air too-hot flag, not an MOT under-bonnet heat advisory.

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.