Fiat 500X Engine Mount: Specs, Fitment & Common Faults

Confirmed: a genuine technical bulletin addresses excess engine mount vibration on the 500X, with a documented passenger side mount failure at just under 49,000 miles — plus a specific plastic component that can break down internally.

Illustration for editorial purposes

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OEM Part Number: 51991080

Genuinely important to know: the engine code (not just the model name) is the reliable way to identify the correct 500X mount, since the same model was often sold with several different engines across its production run, and mounts are rarely interchangeable between them.

2014-2016, 1.4 turbo, genuine right engine mount	Fiat OEM: 51991080 (also referenced as 52068555)
Transmission mount & rear torque strut	Genuinely separate part numbers to the mount shown above — sold individually, and worth inspecting together if chasing a vibration or clunk

Confirmed: A Genuine Technical Bulletin Worth Knowing About — Fiat 500X Engine Mount

This is genuinely worth knowing if you're experiencing unusual vibration: a confirmed technical service bulletin has been issued specifically addressing excess engine mount vibration on the 500X, with documented repairs replacing mounts under this bulletin at relatively low mileage — one specific documented case saw the passenger side mount fail, causing genuine clunking and vibration, at just under 49,000 miles. If your car is showing similar symptoms, it's genuinely worth asking a dealer directly whether this specific bulletin applies to your engine and drivetrain combination.

A genuinely specific, real technical detail worth knowing: the mount contains a plastic component internally that can break down and deteriorate with age and heat cycling, distinct from the more commonly expected rubber perishing — worth knowing this as a genuinely specific failure mode if a mount is condemned, since it explains why a mount can fail even when the visible rubber portions still look reasonably sound.

It's also genuinely worth knowing a useful DIY diagnostic technique for isolating whether the rear mount specifically is responsible for a vibration: disconnecting the rear engine mount and instead supporting the engine on a trolley jack, with a block of wood and a rubber mat placed under the sump for protection, then running the engine to see if the vibration disappears, can help confirm whether this specific mount is the genuine cause before committing to a replacement.

Fiat 500X 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 500X 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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Fiat 500X 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 Fiat Engine Mount

The same part, covered across other Fiat models.