Secondary air injection malfunction on Ford — 1.6/2.0/2.5 Duratec SAI pump on Focus/Mondeo (US-spec mainly, but UK imports).
Ford P0410 — Secondary air injection malfunction on Ford — 1.6/2.0/2.5 Duratec SAI pump on Focus/Mondeo (US-spec mainly, but UK imports). Typical UK independent garage cost: £140–£480.
What actually causes P0410 on a Ford
Ford P0410 in UK is normally on imported US-spec petrol cars — UK-market petrols often don't have SAI. Confirm spec before diagnosing.
Ford engines that log P0410
- 2.0 Duratec HE
- 2.5 Duratec V6
- 1.6 Sigma Ti-VCT
How we diagnose P0410 on a Ford
- Confirm SAI fitted on this VIN
- Activate pump via FORScan
- Check pump current draw
- Inspect plumbing for corrosion
The common misdiagnosis to avoid
Don't diagnose P0410 on a UK-market Focus without checking if SAI is even fitted — many aren't.
Ford P0410 repair cost in the UK
Expect £140–£480 including parts and labour at an independent garage. Main-dealer quotes on Ford are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.
Bob's workshop tip
Ford P0410 — VIN check first. Half these are misdiagnosed on UK cars without SAI.
Codes usually seen alongside P0410 on Ford
- P0411
Symptoms drivers report with P0410
- A loud 'vacuum cleaner' or 'jet engine' noise from under the bonnet for the first 60 seconds after a cold start.
- A sudden drop in revs or a slight stumble just as the air pump shuts off.
- Engine management light (EML) glowing amber, often appearing a minute after driving off from cold.
- A strange 'mooing' or clicking sound when the engine is idling during warm-up.
- The car failing its MOT on the 'Major' defect of having an active EML, even if the emissions are actually okay.
Repairs that clear P0410
- Replace air pump
- Clear or replace hoses
- Replace check valve
For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0410 guide.
Reading P0410 on a Ford properly
A generic reader will show P0410 and nothing else. What matters is the freeze-frame data stored with it — engine speed, load, coolant temperature and fuel trims at the moment the fault was logged — plus whether any other module on the Ford has logged something at the same time. Codes rarely arrive alone, and the order they were stored in usually points at which one is the cause and which are the consequences.
Clearing P0410 without fixing it
Erasing the code resets the Ford's readiness monitors as well as the light. The fault returns on the next drive cycle if the cause is still there, and in the meantime the incomplete monitors can stop the car passing an emissions check. After a genuine repair, the car is driven until the relevant monitor completes before it is handed back.
Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P0410 is showing on your Ford, bring any scan results with you — we will read the live data ourselves, confirm which cause it actually is, and price the repair before any work starts.