How to Fit MG ZS Mud Flaps: DIY Guide (Petrol & EV, 2026)

Fitting mud flaps to an MG ZS looks like a ten-minute job, and on the rear it nearly is — but two things trip owners up. Drill the front arch in the wrong spot and you can nick a wiring loom behind the plastic trim; over-tighten the screws and you strip the soft plastic thread, leaving the flaps rattling loose within weeks. There's a third catch almost nobody warns you about: the screws in many kits are only coated mild steel and start rusting after a fortnight.

This guide walks you through fitting mud flaps to a 2019–2026 MG ZS (petrol and EV) the way owners actually do it — which holes already exist, where you might need to drill, the torque that won't strip the plastic, and the small tips (stainless screws, TPMS, EV wiring) that save you a redo.

Tools and Materials Checklist for MG ZS Splash Guard Installation

Getting the fit right starts with the correct tools on hand — nothing's more annoying than having the car on stands only to find you're missing a bit. This checklist covers a clean, DIY-quality job on either the petrol ZS or the ZS EV.

For hand tools you'll want a trolley jack and a pair of axle stands, a cordless drill with a sharp bit (a right-angle drill or adaptor helps enormously in the tight front arch), a Phillips screwdriver, and a socket and ratchet. Many owners fit the rears with nothing more than a screwdriver by reusing the factory arch-liner screws.

Quality aftermarket kits, like our Replacement Mud Flaps for MG (3/5/6/7/GT/GS/HS/ZS/ONE), come as a full front-and-rear set with the fixings you need. What they often don't come with is decent hardware — which brings us to the single most repeated MG ZS tip.

Recommended Extras for an Easier Job

A plastic trim-removal tool set is worth having — it releases the arch-liner clips without scratching paint or snapping the factory clips. Masking tape holds any paper template in place while you mark holes, and a centre punch stops the drill bit wandering on the plastic.

If your kit uses rubber grommets, keep them; they give a watertight seal and damp vibration. And always wear safety glasses — plastic swarf in the eye is a genuinely bad afternoon. That's it for extras; none of this is exotic.

Pre-Installation: Wheel Arch Inspection and Cleaning Protocol

Before you touch a drill, give the arch a proper look and a clean. It stops the two most common own-goals: a flap fitted over a hidden crack, or moisture trapped behind the flap that starts corrosion on any bare metal.

Inspect the whole black plastic wheel-arch liner for damage. Early ZS liners can develop small stress cracks near the rear mounting points, and fitting a flap onto a compromised liner just makes the rattle worse. If a mount looks tired, sort it first.

Then clean the mounting surface. Wipe the inner lip of the arch trim with isopropyl alcohol to lift road grime, wax and tyre-shine residue, so the flap sits flush. A clean lip also lets you see the existing screw holes clearly, which is what you'll line up to next.

Verifying Wiring Harness Locations (EV owners especially)

This is the one safety check you don't skip. On the ZS EV, owners note you fit the flaps by drilling into the under-lip of the black plastic trim — a zone where sensor and lighting wiring can be routed. The MGEVs fitting thread is a good read on exactly where the holes go.

Gently ease the liner away from the body and shine a torch behind your intended drill points. Confirm there are no wires or cables directly behind them. Thirty seconds here can save you a genuinely expensive wiring repair — treat it as non-negotiable on the EV.

Step-by-Step: Fitting the Rear Mud Flaps

The rear is the easy end, so start here to build confidence. On most MG ZS kits you won't drill at all — the flap reuses the screw that already holds the bottom of the arch liner.

If you want more room you can jack up the rear and drop the wheel, but it isn't essential — owners routinely fit the rears with the wheel on, reaching the lower screw from under the arch. If you do remove a wheel, refit it to the same hub it came off, or the ZS's tyre-pressure monitoring can throw a warning.

Undo the lower arch-liner screw (and release a clip or two with the trim tool only if you need the access). Keep the fixings safe. Offer the flap up to the arch so its top hole sits over that existing screw hole — that's your alignment reference for everything else.

Positioning and Fixing

With the flap held flush against the inner lip of the trim, refit through the existing hole first. If your kit includes a paper template and calls for extra holes, tape it in place, mark the points, and only then drill — steady, light pressure, and drop a grommet into each new hole for a snug, watertight fit.

Drive the screws home and nip them up snug — no more. Over-tightening strips the plastic thread (the number-one cause of flaps working loose); too loose and they buzz. Refit any clips, then flex the flap by hand: it should move a little without binding or touching the tyre. Mud flaps only do their job — protecting the sills and underbody from spray and stone chips — when they're mounted solidly.

Front Wheel Splash Guard Installation: Key Differences from Rear

The fronts follow the same idea as the rears but throw up two real snags owners run into: the holes not aligning, and the original screw being too short once the flap's thickness is added.

Depending on build date — and whether it's the EV or the petrol car — the front flap's holes may not match the existing arch screws. Where they don't, you drill one or two extra holes into the under-lip of the plastic trim (checking for wiring first, as above). And crucially: the original lower screw usually won't be long enough to bite once the flap sits on top, so have a couple of longer stainless self-tappers ready — owners typically reach for around 25–30mm.

Before drilling anything, check steering clearance. Have someone turn the wheel to full lock both ways while you hold the flap in position, and make sure it clears the tyre sidewall and suspension through the full range. On the ZS EV, brake lines and ABS sensor wiring sit close to the inner arch, so confirm their path before the drill goes near.

Final Fitment and Testing

Once the fronts are mounted on the longer screws and everything's nipped up, refit the arch clips and turn the wheel lock to lock a few times. Listen for any scrape or rub — a good fit is silent. It's a two-minute check that protects the brake lines and stops the new flaps wearing prematurely.

Aftermarket vs Genuine MG Mud Flaps: What's the Difference?

When it's time to buy, you're choosing between genuine MG accessory flaps from a dealer and aftermarket sets. Genuine parts give a guaranteed fit, but for most owners a good aftermarket set offers better value with no real downside on the ZS.

Genuine MG mudguard sets are a dealer accessory and priced accordingly — noticeably more than aftermarket, and often sold as part of a "protection pack" with mats and a boot liner. They fit well, but owners frequently mention the same weak point: those rust-prone kit screws.

Good aftermarket sets, like our Replacement Mud Flaps for MG, cost a fraction of the genuine parts for a full set of four, and quality kits use a thicker, flexible reinforced-rubber compound that shrugs off UK winters and harsh UV. Fit a set of stainless screws and you've matched — or bettered — the genuine part for durability.

Installation Costs and Fitment

The bigger saving is labour. A dealer or workshop will charge a fitting fee to bolt on genuine flaps; do it yourself and that cost disappears for roughly half an hour's work per axle. Some dealers won't even take the front job on, judging it uneconomic for the fiddly alignment.

On fitment there's no meaningful advantage to genuine over a quality aftermarket set — both are moulded to the ZS arch shape and use the same factory mounting points. The value case clearly favours a well-made aftermarket kit plus your own stainless hardware.

Durability Expectations: How Long Do Mud Flaps Last on an MG ZS?

How long a set lasts comes down to the material and the conditions it faces. Knowing the wear signs helps you catch a tired flap before it starts sagging into the tyre or letting spray through.

Good flexible-rubber flaps typically last several years in a temperate climate. In harsh-UV regions like Australia, or where winter road salt is heavy as in parts of the UK, expect the material to age a little faster before it starts to harden and crack.

The first sign of wear is usually fine cracking along the bottom edge; later, the mounting holes can elongate from constant flexing and vibration. Neither is urgent on its own, but both are your cue to plan a replacement.

Factors That Reduce Lifespan

A few things speed up wear. Sustained motorway speeds above roughly 110 km/h (about 70 mph) add wind load and flex fatigue, and leaving road salt, mud and de-icer to sit on the rubber without an occasional rinse degrades it faster.

The replacement signs are easy to spot: deep cracks, the flap sagging well out of shape, or a mount that won't stay tight even after re-doing the screws. Any of those and it's time for a fresh set — cheap insurance against paint chips and a grubby lower body.

Common Installation Mistakes and How to Avoid Them

Even a simple fit can go sideways. Sidestep a handful of common errors and your flaps will sit right, look right, and last for years without marking the car.

Mistake one is drilling without lining up to the existing holes or a template. Eyeballing it leaves the flaps skewed, opens gaps against the arch, and loads the mounts unevenly — a fast route to stress cracks in the flap or the trim.

Mistake two is over-tightening. The mounts are plastic; crank the screw and you strip the thread, which is the single most common reason flaps rattle loose within weeks. Nip them up snug and stop — a driver by feel is fine, you're not torquing a wheel nut.

Critical Errors in Sealing and Clearance

Mistake three is binning the rubber grommets if your kit supplied them — they seal out moisture and damp vibration, and without them the mounting holes elongate over time.

Mistake four is mounting the flap too close to the tyre, which sets up a constant rub that quickly wears a groove into the flap edge. Keep a sensible gap from the tyre sidewall.

Mistake five is skipping the front steering-lock check. Turn the wheels lock to lock after fitting to confirm the flap clears the tyre and suspension through the full range — the one test that catches a front-arch fit gone slightly wrong.

Post-Installation: Testing and Maintenance Schedule

With the flaps on, a couple of quick checks and a light routine keep them secure and effective for their whole life — a few minutes here and there, no more.

Straight after fitting, take a short drive and listen for rattles, rubbing or flapping, especially over bumps and on lock. Let the car cool, then recheck the screws once more.

Within the first week, go round and re-nip every screw. The plastic and rubber settle after a few heat cycles, which can leave the fixings slightly loose — this one check is what keeps them tight long-term.

Long-Term Care and Inspection

Once a month, hose off any build-up of mud, salt or grime from the flaps and arches, and glance at the mounting holes for any sign of stretching while you're there.

Once a year, it's worth taking the flaps off for a proper look — check the liner behind for hidden cracks or trapped moisture, and put a smear of silicone grease on the grommets to keep them supple. That's the whole maintenance story.