Volkswagen EA837 (3.0 TFSI supercharged)
3.0 L · V6 · supercharged · petrol · 2008–2018
Also known as: ea837, 3.0 tfsi, 3.0 supercharged v6 audi, s4 engine, cayenne s engine
The Volkswagen Group's supercharged 3.0 V6 — a Roots blower sitting in the vee rather than a turbocharger — in the Audi S4, S5, A6, A7 and Q5, and the Porsche Cayenne and Panamera. Its turbocharged successor of the same displacement is the EA839.
The supercharger's cooling is a separate circuit with its own pump, and it is the fault that reads as nothing at all. When the pump or the intercooler coolant is neglected, charge temperature rises, the engine quietly pulls timing, and the car simply feels flat — no code, no noise, no smoke. A 3.0 TFSI that has lost its edge is that circuit before it is anything expensive.
The thermostat and water pump are a single plastic module driven off the timing chain, at the back of the engine. It fails, and reaching it means removing the supercharger. The part is inexpensive and the job is not, which is why a coolant leak on one of these produces an estimate that looks like a mistake.
The timing chain and its tensioner wear on earlier engines, and being direct-injected it deposits carbon on the intake valves at mileage — the ordinary consequence of the design, and the reason a rough idle at 80,000 miles is often a cleaning job rather than a fault.
Cars fitted with this engine
2 generations, across 1 make. From the authored catalogue — an absent car means the catalogue has not reached it, not that the engine was never fitted.
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Posted about this engine
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about EA837 (3.0 TFSI supercharged).