Audi A4 Engine Mount: Specs, Fitment & Common Faults
On the A4, engine mount bolts have genuinely sheared off entirely while driving, just months after engine work 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
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Audi A4 Engine Mount: OEM Part Number
| B9/C8 generation, 2.0 TDI, right engine mount | Audi OEM: 4M0199870AN — shared across A4, A4 Allroad, A5 Sportback, A6 Avant, A7 Sportback of the same MLB platform |
|---|---|
| B9/C8 generation, left engine mount | Audi OEM: 4M0199869AM — genuinely a different part from the right-side mount, not a mirror-image of the same component |
| Higher-output/six-cylinder engines | A genuinely different, typically heavier-duty mount specification applies given the increased engine weight and vibration characteristics — confirm your exact engine code before ordering |
Audi A4 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 A4 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.
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A Genuinely Alarming, Honest Real Account Worth Knowing — Audi A4 Engine Mount
If you've recently had engine work done that would have required removing a mount, this is genuinely worth knowing: documented cases describe engine mount bolts shearing off entirely while driving in the months following such work, with the theory being the mount wasn't properly resecured to the correct torque afterward. It's genuinely worth having the mount bolts specifically checked if a clunk develops shortly after this kind of work.
It's also genuinely worth knowing that these mounts typically contain a silicone fluid that acts as a damper — if this leaks out over time, the two halves can move more freely and eventually make contact, and if left unaddressed, the mount can fully separate.
Audi A4 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.