Ford Focus Mk3 Engine Mount: Specs, Fitment & Common Faults

The passenger-side hydraulic mount is the Focus's consistent, well-documented weak point — plus why budget aftermarket replacements can make vibration worse, not better.

Generation covered: this guide is for the third-generation Focus, built 2011–2018 (commonly the 2014–2018 registered examples still in daily use). The newer Mk4 Focus (2018–) uses different part numbers throughout — check your V5C logbook or VIN if you're unsure which generation you have.

Illustration for editorial purposes

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.

OEM Part Numbers

Accuracy note: most Mk3 Focus engines use three separate mounts (engine/motor mount, transmission mount, and rear torque strut) — each has its own part number, and replacing only one when several are worn won't fully resolve vibration or clunking.

Main engine mount (2012–2018, most engines)	Ford OEM: CM5Z-6038-A
Alternative mount reference (2012–2018)	Ford OEM: AV6Z-6038-A — confirm which applies to your specific engine/transmission combination
Transmission mount & rear torque strut	Separate part numbers to the main engine mount — sold individually or as a kit

If you're experiencing a clunk on acceleration or gear changes, it's worth having all three mounts inspected together rather than assuming the main engine mount alone is at fault — on higher-mileage cars, worn transmission or torque strut mounts are just as common a cause.

Confirmed: The Passenger-Side Hydraulic Mount Is the Focus's Consistent Weak Point

Across multiple Focus generations — both 2006-2012 and 2013-2018 models are consistently reported — the passenger-side engine mount is the one that fails first and most often, and it's genuinely worth understanding why. Unlike the simpler solid rubber mounts elsewhere on the car, this one is fluid-filled to provide better vibration damping, but that same design means the rubber can tear internally and let the hydraulic fluid leak out, at which point the mount collapses. Once it does, engine vibration transmits directly into the cabin — a strong shake through the steering wheel and pedals, particularly noticeable when stopped in Drive, along with dashboard rattles and a distinct clunk when accelerating, braking, or shifting between Drive and Reverse.

A genuine, checkable visual test: the passenger-side mount is easy to inspect directly — when healthy, there's a clear, visible gap between the rubber portion and the metal bracket beneath it. On a failed mount, the rubber has collapsed enough to be touching or nearly touching the bracket, sometimes with visible dark hydraulic fluid staining around it. This is a genuinely useful check before paying for a diagnosis.

A Genuine Warning About Budget Aftermarket Mounts on This Specific Part

This is worth taking seriously: independent mechanics and owners consistently report that budget aftermarket brands (several forum threads specifically name Anchor, DEA, and Westar) can actually cause more vibration than the worn-out original mount they replaced, and frequently fail again within months rather than years. This isn't a universal "aftermarket is always worse" claim — it's a pattern specific enough to this exact mount that it's worth paying the premium for a genuine Motorcraft (Ford's own parts brand) or well-reviewed mid-tier hydraulic mount rather than the cheapest option available, given how many owners report doing the job twice after trying to save money the first time.

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 Focus Mk3 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 Focus Mk3. 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 Ford Focus Mk3 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.

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 Ford Engine Mount Guides

The same part, covered across other Ford models.