Audi P0410

Secondary air injection on Audi — 2.0 TFSI and 1.4 TSI combi-valve and pump failures.

Audi P0410 — Secondary air injection on Audi — 2.0 TFSI and 1.4 TSI combi-valve and pump failures. Typical UK independent garage cost: £180–£950.

What actually causes P0410 on a Audi

On Audi 2.0 TFSI, the SAI combi-valve sticks closed from carbon in the air ports — the pump itself is often fine. On 1.4 TSI, the pump motor seizes after years of moisture ingress. VCDS readiness for SAI never sets until P0410 clears, so MOT emissions can pass while readiness fails — a real headache for some test stations.

Audi engines that log P0410

• 2.0 TFSI EA113/EA888
• 1.4 TSI EA111
• 1.8 TFSI EA888

How we diagnose P0410 on a Audi

1. VCDS: actuate SAI pump and log current draw, watch combi-valve operation
2. Remove combi-valve and check for free movement
3. Clean carbon from cylinder head air ports
4. Pressure-test air rail from pump to head
5. Replace pump only after confirming free combi-valve and clear ports

The common misdiagnosis to avoid

Don't replace an Audi SAI pump before bench-testing the combi-valve — on TFSI it's the valve, not the pump, four times out of five.

Audi P0410 repair cost in the UK

Expect £180–£950 including parts and labour at an independent garage. Main-dealer quotes on Audi 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

TFSI P0410 + SAI readiness fail is a £180 combi-valve and an hour's labour on most jobs — main dealers will quote £900 for the whole assembly.

Codes usually seen alongside P0410 on Audi

• P2440
• P2442
• 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 Audi 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 Audi 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 Audi'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 Audi, 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.