P0410 fault code: Secondary Air Injection System

P0410 means “Secondary Air Injection System” — an auxiliary emission controls fault in the powertrain.

Can I DIY?

Professional-only boundary. You may confirm P0410 on a scanner; air-pump or valve work is garage diagnosis.

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 P0410

Do not drive until checked. The computer has logged a fault in the secondary air injection system, which adds extra air into the exhaust after a cold start. On its own this is an emissions-control issue, not a brake or steering failure.

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

  • Secondary Air Injection System: Registration number
  • Secondary Air Injection System: Exact code P0410 and any companion codes
  • Secondary Air Injection System: Whether the engine management light is steady or flashing
  • Secondary Air Injection System: Freeze-frame coolant temperature if the scanner showed it
  • Secondary Air Injection System: Whether any air hose in the bay was obviously disconnected
P04xxAuxiliary emission controls
MOT fail riskif the warning light stays on

What does P0410 mean?

P0410 is a generic (SAE standard) powertrain code reported by your car’s engine control unit. It sits in the P04xx block, which covers auxiliary emission controls. The stored description is “Secondary Air Injection System”. The code itself tells you which circuit or system tripped the fault — not always the exact part that failed.

Will P0410 fail an MOT?

A lit engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. Secondary air also supports cold-start emissions, so the lamp and the emissions test can both fail.

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.
P0400Exhaust Gas Recirculation Flow P0401Exhaust Gas Recirculation Flow Insufficient Detected P0402Exhaust Gas Recirculation Flow Excessive Detected P0403Exhaust Gas Recirculation Control Circuit P0404Exhaust Gas Recirculation Control Circuit Range/Performance P0405Exhaust Gas Recirculation Sensor 'A' Circuit Low P0406Exhaust Gas Recirculation Sensor 'A' Circuit High P0407Exhaust Gas Recirculation Sensor 'B' Circuit Low

P0410 — quick answers

Is it safe to drive with P0410?

Do not drive until checked. We have no verified driving guidance for P0410. Treat as do not drive until a garage has checked it. This page will not guess a milder class from other emissions codes.

Will P0410 fail my MOT?

A lit engine management light is a Major defect at MOT (automatic fail) until the fault is repaired and the light stays off. Secondary air also supports cold-start emissions, so the lamp and the emissions test can both fail.

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.