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

Find Audi A3 Engine Mount Here!

Opens live listings in a new tab.

OEM Part Number: 5Q0199555BJ

Accuracy note: genuine MQB platform reference, confirmed shared across Audi A3/S3/TT, VW Golf/Jetta/GTI, Seat Leon, and Skoda Octavia of the relevant era — always confirm the exact suffix via VIN, since transmission mounts vary within this family by engine code. This platform genuinely uses a 3-point mounting system — main engine mount, transmission mount, and a rear lower torque/dogbone mount — each sold as a separate part number.

Transmission mount (left side)	Genuine VAG reference: 5Q0199555BJ (also referenced as 5Q0199555AD, 5Q0199555T, 5Q0199555BG, 5Q0199555R) — shared across A3, S3, TT, Golf, Jetta, GTI, Leon, Octavia
Main engine mount (right side)	A genuinely different part number from the transmission mount — confirm your exact engine code before ordering, since this varies across the TSI/TDI range
Rear torque/dogbone mount, manual or 6-speed DSG	Confirmed by aftermarket manufacturers as a genuinely different part from the 7-speed DSG version — the two gearbox types use different dogbone mount specifications despite occupying the same mounting position
Rear torque/dogbone mount, 7-speed DSG	Genuinely a different reference from the manual/6-speed DSG mount — confirm your exact gearbox before ordering

Audi A3 Engine Mount: 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.

Find Audi A3 Engine Mount Here!

Opens live listings in a new tab.

A Genuinely Alarming, Honest Real Account Worth Knowing — Audi A3 Engine Mount

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.

Audi A3 Engine Mount: Symptoms, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Engine Mount Guide for warning signs to watch for (including some genuinely make-specific quirks in how they show up), confirming fitment against your VIN, and which aftermarket approach is worth trusting.

More Audi Engine Mount

The same part, covered across other Audi models.