Mercedes-Benz P0410

Secondary air injection malfunction on Mercedes — M271 Kompressor SAI pump is the textbook UK failure.

Mercedes-Benz P0410 — Secondary air injection malfunction on Mercedes — M271 Kompressor SAI pump is the textbook UK failure. Typical UK independent garage cost: £250–£1400.

What actually causes P0410 on a Mercedes-Benz

On the M271 1.8 Kompressor, P0410 is one of the most common stored codes we see — the secondary air pump corrodes internally, the combi-valve sticks open, and on bad cases the inlet manifold ports clog with carbon. A complete fix needs the pump, both combi-valves and often the manifold cleaned. Half-jobs return within months.

Mercedes-Benz engines that log P0410

• M271 1.8 Kompressor (C180/C200/SLK200, 2003–2010)
• M272 V6
• M271 EVO direct-injection 1.8

How we diagnose P0410 on a Mercedes-Benz

1. STAR Diagnosis: actuate SAI pump and watch live current draw
2. Inspect combi-valves on inlet manifold for stuck/seized operation
3. Pressure-test air rail back to pump for blockages
4. Inspect inlet manifold air ports for carbon/coke build-up
5. Quote complete package — pump + valves + clean — never just the pump

The common misdiagnosis to avoid

Mercedes M271 P0410 is rarely just the pump — budget for combi-valves and manifold cleaning together or you'll be back inside a year.

Mercedes-Benz P0410 repair cost in the UK

Expect £250–£1400 including parts and labour at an independent garage. Main-dealer quotes on Mercedes-Benz 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

M271 owners chasing intermittent MOT emissions fails are nearly always P0410 — get the full package quoted up front, no surprise extras at MOT time.

Codes usually seen alongside P0410 on Mercedes-Benz

• P0411
• P0412
• P0413

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.