P0507 fault code: Idle Air Control System RPM Higher Than Expected

Last updated · OBDCode UK editorial

Can I drive with P0507? — Drive with care

You may continue if idle is only slightly high and the car is otherwise controllable. Stop if idle races, the car lurches in gear, or the engine management light flashes.

P0507 means “Idle Air Control System RPM Higher Than Expected” — a vehicle speed and idle control fault in the powertrain. Drive with care. The engine computer has measured idle speed above the target it expects when you are stopped. This is an idle-control complaint, not a crash warning, but a high idle can make the car creep or feel harsh in gear.

Can I DIY?

Caution — conditions apply. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage.

Caution — conditions applyDIY boundary
ToolsBasic tools only — for example a household socket set, tyre gauge, or a consumer OBD reader.

Some checks may be possible for a careful DIY driver with the right tools and a safe place to work. Stop if anything feels beyond your skill or kit.

Hot systems

Never open a hot coolant cap — pressure can scald you. Exhaust and catalytic converter get hot enough to burn and ignite debris. Stay clear of electric fans; they can run after shut-off.

P05xxVehicle speed and idle control
MOT fail riskif the warning light stays on

What does P0507 mean?

P0507 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P05xx block, which covers vehicle speed and idle control. The stored description is “Idle Air Control System RPM Higher Than Expected”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

How to diagnose P0507 yourself

  1. Confirm P0507 and freeze-frame: Scan with an OBD-II reader while the car is stationary. Note whether P0507 is current or pending, freeze-frame RPM, and any companion codes. Stop if: The engine management light is flashing, or you would need to idle in a closed garage to finish the scan.
    Generic driver footwell showing a broad OBD-II socket search zone and the usual 16-pin socket shape.
    Park safely and switch off before locating the socket. Its position varies, so use the vehicle handbook and never force or dismantle trim.
  2. Note idle speed while stationary: In open air, parking brake on, Park or Neutral selected, foot off the pedal. When the engine is fully warm, note tachometer RPM or scanner live RPM. Do not road-test to 'see how high it goes'. Stop if: The engine races, the car lurches in gear, or you cannot hold it still with the brake. Switch off and stop checks.
  3. Look for obviously disconnected intake hoses: Engine off and cold. Open the bonnet. Look only for intake or vacuum hoses that are clearly disconnected, split, or left unclipped after recent work. Do not remove parts or go under the car. Stop if: The engine is hot, you would need to crawl under the car, or electric fans start with the bonnet open. Close the bonnet and book a garage.

Will P0507 fail an MOT?

A steady engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. High idle on its own is not a separate MOT item in the inspection manual.

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.

What the MOT data says

No MOT certificate item corresponds to this code; MOT outcome data cannot be shown.

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.
P0500Vehicle Speed Sensor 'A' P0501Vehicle Speed Sensor 'A' Range/Performance P0502Vehicle Speed Sensor 'A' Circuit Low Input P0503Vehicle Speed Sensor 'A' Intermittent/Erratic/High P0504Brake Switch 'A'/'B' Correlation P0505Idle Air Control System P0506Idle Air Control System RPM Lower Than Expected P0508Idle Air Control System Circuit Low

P0507 — quick answers

Is it safe to drive with P0507?

Drive with care. You may continue if idle is only slightly high and the car is otherwise controllable. Stop if idle races, the car lurches in gear, or the engine management light flashes.

Can I fix P0507 myself?

Caution — conditions apply. We do not publish DIY repair or strip-down steps for this code on this page. Read codes and observe only; leave the repair to a qualified garage. Basic tools only — for example a household socket set, tyre gauge, or a consumer OBD reader.

Will P0507 fail my MOT?

A steady engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. High idle on its own is not a separate MOT item in the inspection manual.

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.