P0124 fault code: Throttle/Pedal Position Sensor/Switch 'A' Circuit Intermittent

P0124 means “Throttle/Pedal Position Sensor/Switch 'A' Circuit Intermittent” — a fuel and air metering fault in the powertrain.

Can I DIY?

Professional-only boundary. Do not road-test an intermittent throttle glitch; confirm P0124 and recover if power cuts.

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 P0124

Do not drive. Throttle or pedal position sensor A is intermittent, so power can cut or surge as the signal drops out and returns.

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

  • Throttle/Pedal Position Sensor/Switch 'A' Circuit Intermittent: Registration number
  • Throttle/Pedal Position Sensor/Switch 'A' Circuit Intermittent: Exact code P0124 and how often power cut or surged
  • Throttle/Pedal Position Sensor/Switch 'A' Circuit Intermittent: Whether it happened on bumps, in the wet, or when the carpet snagged the pedal
  • Throttle/Pedal Position Sensor/Switch 'A' Circuit Intermittent: Companion P0120–P0123 or pedal-sensor B codes
P01xxFuel and air metering
MOT fail riskif the warning light stays on

What does P0124 mean?

P0124 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 “Throttle/Pedal Position Sensor/Switch 'A' Circuit Intermittent”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0124 fail an MOT?

An illuminated engine management light is a Major defect at MOT until repaired and the lamp stays off. P0124 is intermittent; unsafe throttle cut-out is also a reason not to present the car until it is diagnosed.

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

P0124 — quick answers

Is it safe to drive with P0124?

Do not drive. We have no verified driving guidance for P0124 — treat as do not drive until checked. An intermittent throttle/pedal circuit can cut power in traffic; do not keep driving to catch the glitch.

Will P0124 fail my MOT?

An illuminated engine management light is a Major defect at MOT until repaired and the lamp stays off. P0124 is intermittent; unsafe throttle cut-out is also a reason not to present the car until it is diagnosed.

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.