MajorCommonEngine

Audi S4: 3.0 TFSI Supercharger Coupler Wear and Rattle

3.0 TFSI Supercharger Coupler Wear and Rattle is a common engine fault on the Audi S4 on the 2009–2016 cars, and we rate it major. Putting it right costs $900 to $2,200 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 10 documented faults on the Audi S4.

Vehicle: Audi S4
Engine: 3.0L
Years: 2009–2016
Fuel: petrol
System: Engine

This page covers the Audi S4 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Audi S4 faults10 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the Intake manifold yet. We would rather show none than show a picture of a different part.

What goes wrong

The 3.0 TFSI V6 is supercharged, not turbocharged, and drives its Eaton TVS blower through an isolator coupler that sits between the drive pulley and the rotor pack. The coupler's elastomer inserts harden and crumble with heat cycling and age, letting the rotors move independently of the pulley. The result is a rattle or chatter, most obvious at idle and on light throttle once warm, and it worsens gradually rather than failing suddenly. The coupler is a serviceable part on its own, but reaching it means removing the intake manifold and the supercharger assembly, which is where most of the cost sits. Left long enough the play accelerates wear in the rotor bearings, at which point the whole blower is replaced instead.

What you would notice

Rattle or marbles-in-a-can chatter from the top of the engine at warm idle, easing as revs rise
Noise most noticeable with the bonnet up, coming from the centre vee of the engine rather than the accessory belt
A brief clatter on shutdown as the rotors come to rest
Gradual loss of low-end urgency if the blower itself has begun to wear

How to check it

Where to look. Supercharger assembly in the vee of the V6, beneath the intake manifold; the coupler sits at the front of the blower behind the drive pulley

Start the car from cold and let it reach operating temperature, then listen at idle with the bonnet open — a healthy supercharger whines smoothly and does not rattle. Blip the throttle and listen as revs settle back to idle, which is when a worn coupler is loudest. Ask whether the supercharger has ever been off the engine, since the coupler is usually replaced at the same time as any other blower work. A car with a documented coupler replacement is a positive, not a warning.

Parts involved: Intake manifold.

What it costs to put right

$900 to $2,200 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the supercharger coupler ever been replaced, and do you have the invoice?”
“Is there any rattle from the top of the engine at idle when it is fully warm?”
“Has the supercharger ever been removed for service — for example during a carbon clean?”

Now check the Audi S4 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Audi S4 buyer questions

Is 3.0 tfsi supercharger coupler wear and rattle serious on a Audi S4?

We rate it major and common on the Audi S4. The 3.0 TFSI V6 is supercharged, not turbocharged, and drives its Eaton TVS blower through an isolator coupler that sits between the drive pulley and the rotor pack. The coupler's elastomer inserts harden and crumble with heat cycling and age, letting the rotors move independently of the pulley. The result is a rattle or chatter, most obvious at idle and on light throttle once warm, and it worsens gradually rather than failing suddenly. The coupler is a serviceable part on its own, but reaching it means removing the intake manifold and the supercharger assembly, which is where most of the cost sits. Left long enough the play accelerates wear in the rotor bearings, at which point the whole blower is replaced instead.

How much does it cost to fix on a Audi S4?

$900 to $2,200 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Audi S4 years are affected?

Our research records this fault on the 2009–2016 Audi S4. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.