Mercedes-Benz A-Class Engine Mount: Specs, Fitment & Common Faults

A genuinely alarming, honest account: a persistent noise survived multiple dealer visits and several part replacements before an independent specialist traced it to the top strut mounts, already on their fourth superseding part number.

Illustration for editorial purposes

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OEM Part Number: A2472402800

Genuinely important to know: most A-Classs use three separate mounts (engine, transmission, and a rear torque strut) rather than one part covering the whole job — check which one is actually worn (a common DIY mistake is replacing all three when only one has failed) before ordering.

W177 (2018+), 1.3L petrol (M282), genuine front right engine mount	Mercedes OEM: A2472402800 (also referenced as A2472402700) — shared across B-Class, CLA, GLA of the same MFA2 platform
Opposite-side mount & transmission mount	Genuinely separate part numbers from the mount shown above, sold individually — worth inspecting together given they typically wear at a similar rate, and EQ Boost mild-hybrid variants add a further consideration given the different engine/ISG mass distribution

Mercedes-Benz A-Class 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 A-Class 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.

Mercedes-Benz A-Class Engine Mount reference plate

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A Genuinely Alarming, Honest Real Account Worth Knowing — Mercedes-Benz A-Class Engine Mount

If a persistent knocking or vibration has survived multiple dealer visits, this is genuinely worth knowing: one documented case saw exactly this, with shock absorbers, top mounts, and the rear engine mount all replaced across several visits without resolving the noise, the dealer ultimately admitting they were unable to identify the cause. An independent specialist was eventually able to trace the fault to the top strut mounts specifically, which were already on their fourth superseding part number at the time, suggesting the manufacturer has been aware of an ongoing design issue with this component for some time. Worth trying a genuinely experienced independent specialist if a main dealer has repeatedly been unable to resolve a persistent noise, rather than continuing to accept repeated part replacements that aren't working.

A genuinely useful fix worth trying first: checking and correcting the torque setting on the engine mounting bolts themselves, advice that came directly from the manufacturer's own factory guidance in one documented case, resolved a persistent knocking noise entirely, worth checking this simple detail before assuming a full mount replacement is needed.

It's also genuinely worth knowing a useful diagnostic technique: with the bonnet open, having someone gently blip the throttle while you watch the engine is a genuine, simple way to visually confirm a badly worn mount, since the engine will visibly lift or rock on its mounting if the mount is genuinely failing.

Mercedes-Benz A-Class 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 Mercedes-Benz Engine Mount

The same part, covered across other Mercedes-Benz models.