Audi A3 Engine Mount: Specs, Fitment & Common Faults

A genuinely alarming, honest account: engine mount bolts sheared off entirely while driving, just months after a cambelt job that required removing the mount — plus an honest account of a clunk that was just a loose bolt, fixed for free.

Illustration for editorial purposes

OEM Part Numbers

Accuracy note: we weren't able to verify a confident Audi A3 engine mount part number at the time of writing. Please confirm the correct part via an Audi dealer or parts specialist using your VIN.

The Part That Quietly Absorbs Everything

Engine mounts do a genuinely thankless job — holding a violently vibrating engine in place while isolating that vibration from the cabin — and when they wear out, the change is often gradual enough that owners adjust to it without realising something's actually wrong.

Before you buy: engine mount design and quantity vary by engine size and transmission type. Always confirm against your VIN before ordering.

What It Does

Engine mounts secure the engine and transmission to the chassis while absorbing vibration and movement, preventing that vibration from transferring directly into the cabin. Most versions of the A3 use several mounts working together — typically at least one on each side of the engine plus a torque mount — and a single failed mount can throw off the whole assembly's balance.

Fitment & Compatibility

Mount design and positioning differ between engine sizes and transmission types (manual versus automatic) of the A3. Always confirm the exact mounts fitted to your specific engine and transmission combination before ordering, since manual and automatic versions often use different mount designs even on the same engine. Whether you're sourcing a replacement engine mount for your Audi A3 from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying, and confirm you're ordering the correct side — driver's side (RH in the UK) or passenger side (LH in the UK) — since these are not interchangeable.

Common Faults

Symptoms of Failure

Noticeable vibration through the cabin, especially at idle — often the earliest and clearest sign of a worn mount.
Clunking noise when accelerating or braking — points to a mount no longer properly restraining engine movement.
Visible engine movement when revving in neutral — a worn or broken mount can allow far more movement than normal.
Increased noise, especially over bumps — a failing mount can let the engine knock against surrounding components.

DIY Replacement Difficulty

This is a moderate-to-difficult DIY job depending on which mount needs replacing — some are easily accessible, while others require supporting the engine's weight with a jack or hoist while the mount is removed and replaced. Getting this step wrong risks damage to the engine or surrounding components. Expect 1–3 hours depending on which mount and how accessible it is on your specific engine layout.

A Genuinely Alarming, Honest Real Account Worth Knowing

If you've recently had a timing belt or chain job done, this is genuinely worth knowing: one documented case saw the bolts securing an engine mount shear off entirely while driving, just 5,000 miles after a cambelt replacement, with the theory being that the mount, which needed to be removed to carry out that job, wasn't properly resecured to the correct torque afterward. It's genuinely worth having the mount bolts specifically checked if a clunk develops within the months following any engine work that would have required removing a mount, since a bolt that shears off entirely can cause a sudden, dramatic loss of drive rather than a gradual worsening.

A genuinely honest, real account worth knowing before paying for a full replacement: one documented case saw a persistent clunk traced not to a worn or failed mount at all, but simply to a mounting bolt that had come loose. Re-tightening the bolt resolved the clunk entirely, at no cost and in about thirty minutes, compared with a dealer quote of several hundred pounds for a full mount replacement. It's genuinely worth checking whether the mount's bolts are simply loose before assuming the mount itself needs replacing.

It's also genuinely worth knowing that these mounts typically contain a silicone fluid that acts as a damper between the two rubber sections — if this fluid leaks out over time, the two halves can move more freely and eventually make contact with each other, and if left unaddressed, the mount can fully separate. Worth having a visibly deteriorating or leaking mount replaced before it reaches this point.

OEM vs. Aftermarket

Reputable aftermarket engine mounts are generally a safe, cost-effective alternative to OEM parts, provided they match your exact engine and transmission specification. This is one area where cheap, poorly designed mounts can genuinely accelerate wear on adjacent components, so it's worth choosing an established brand over the very cheapest option available.

More Audi Engine Mount Guides

The same part, covered across other Audi models.