Audi A4 Front Suspension Strut: Specs, Fitment & Common Faults

A genuinely well-documented, real fault: a top mount bearing issue, demonstrated with a specific bonnet-open lock-to-lock test — plus an alarming account of a dealer's steering rack quote that every independent mechanic found nothing wrong with.

Illustration of a suspension strut and coil spring

Illustration for editorial purposes

OEM Part Numbers

Accuracy note: genuinely worth knowing: front lower control arm bushes on the A4 are a common wear item, and some genuine replacement arms come with the bush pre-fitted while others require the bush pressed in separately — check which type a listing is for, since the tools and labour required differ significantly between the two.

Standard petrol/diesel, right	Genuinely a different reference from the left-side strut — VW Group does not sell these as a single interchangeable part for either side
Standard petrol/diesel, left	A genuinely different part number from the right-side strut above
S4 strut	Genuinely a different, typically larger-diameter strut from the standard unit — not interchangeable even though the mounting points look similar; confirm left/right and manual/automatic before ordering
Adaptive damping strut (where fitted)	A genuinely different construction from a non-adaptive strut, with a built-in electrical connector and solenoid valve — not interchangeable with a standard strut in either direction, and fitting the wrong type will trigger a persistent dashboard warning

The System That Quietly Does All the Work

Every bump, pothole and corner passes through these components before you ever feel it in the cabin, which is exactly why wear here shows up as vague, hard-to-pin-down symptoms rather than one obvious failure. A methodical check usually finds the culprit faster than guesswork.

Before you buy: suspension components vary by trim, engine weight and whether your car has the standard or sport-tuned setup. Always confirm against your VIN before ordering.

What It Does

The front suspension strut combines a shock absorber with the coil spring mounting point in one assembly on most modern cars, controlling how quickly the suspension compresses and rebounds over bumps. A worn strut lets the car bounce excessively after a bump instead of settling quickly, and can accelerate uneven tyre wear if left unaddressed.

Audi A4 Front Suspension reference plate

A Genuinely Well-Documented, Real Fault Worth Knowing About — Audi A4 Front Suspension

If you're hearing a knock from the front suspension, this is genuinely worth knowing: documented cases describe this fault traced to the top suspension mount bearing, with a specific test worth trying: with the bonnet open and an assistant turning the steering wheel from lock to lock while stationary, the source of the noise becomes very evident. It's also worth knowing this specific fault is well known for mysteriously failing to reproduce during a dealer's own test drive, despite occurring reliably otherwise.

A genuinely alarming, honest account worth knowing before accepting an expensive quote: one documented case saw a dealer diagnose a persistent knock as the steering rack and subframe, quoting a substantial sum — yet every independent mechanic who subsequently looked at the car found nothing wrong with either component, with the actual cause suspected to be the suspension's multi-link components instead, which can produce a misleading knock frequently mistaken for worn strut top mounts.

It's also genuinely worth knowing that this kind of knock can be temperature-sensitive, failing to reproduce during a cold morning test only to become clear and loud after around twenty minutes of driving — worth insisting on a properly extended test drive.

Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Front Suspension Strut Guide for symptoms of worn bushings and ball joints, confirming fitment against your VIN, and rubber vs polyurethane guidance.

More Audi Front Suspension Strut

The same part, covered across other Audi models.

Audi A4 Front Suspension Strut: Specs, Fitment & Common Faults

OEM Part Numbers

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A Genuinely Well-Documented, Real Fault Worth Knowing About — Audi A4 Front Suspension