Ford Ka+ Rear Springs: Specs, Fitment & Common Faults

A cracked spring insulator or a broken chunk of the coil itself is a genuinely common, well-documented cause of rear rattle on Ford's smaller platforms.

Illustration for editorial purposes

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A Genuinely Common, Specific Cause of Rear Rattle Worth Checking First

Across owner forums, a broken piece of coil spring insulator, or a small chunk of the spring itself, knocking around in the lower spring seat is a genuinely commonly reported cause of a rear rattle on the Ka+. It's worth visually inspecting the coil springs for any visible cracking or a broken end before assuming a more expensive fault is to blame.

A genuinely sensible diagnostic order: before assuming bushings or shocks are worn, it's worth visually inspecting the coil springs themselves for any visible cracking or a broken end — a genuinely common, cheap-to-fix cause that gets mistaken for expensive suspension wear.

Ford Ka+ Rear Springs: A Part That Fails Quietly, Then Suddenly

On the Ford Ka+, a rear spring often sags gradually for months without an obvious symptom beyond a slightly lower ride height, then fails suddenly at the coil's end with an audible clunk — worth bearing in mind if you notice one rear corner sitting lower than the other.

Before you buy: engine/trim and body style both affect spring rate and fitment. Always confirm against your VIN before ordering.

Ford Ka+ Rear Springs: Watch: Replacing It

🎬 Watch: 2015 Ford Fiesta rear spring replacement

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This video shows a closely related car on the same platform, so the spring seats and fixings can differ slightly on yours.

OEM Part Number: confirm via VIN — rear coil springs (aftermarket) Monroe SP4929 / KYB K-Flex RA5845

Accuracy note: Covers the Ford Ka+ (2016-2019) as listed in the UK aftermarket catalogues. Rear coil springs are sold as a pair for the axle and should be replaced as a pair, because a new spring beside a tired one leaves the car sitting unevenly. The right spring depends on the engine and gearbox, the suspension type (standard, sport or heavy-duty) and, on some cars, the body style. The references below are UK aftermarket catalogue listings for this generation, labelled by brand with the fitment details the catalogue gives; carmakers rarely publish the genuine number against these, so match a genuine spring against your VIN if you want a guaranteed fit. genuinely worth knowing: sportier trims often use a genuinely different rear axle design with a different spring and spring seat from standard cars — confirm your exact trim before ordering rather than assuming a universal fit.

Rear coil springs (aftermarket)	Monroe SP4929 (333 mm); KYB K-Flex RA5845 (331 mm); Lesjöfors 4227657; Triscan 875016195
Genuine (OE) numbers quoted	None quoted in the catalogue listings — the genuine spring varies by engine, suspension type and body style, so order it against your VIN
Standard trims	Confirm your exact engine and trim, since Ford used multiple distinct rear spring references across most model generations
higher-output	A genuinely different spring and spring seat design from the standard version, reflecting a different rear axle architecture on the sportier trim
Estate/higher-load body style, where applicable	Genuinely a stiffer rear spring rate than the equivalent standard body style, to handle the increased load-carrying capacity

Always replace Ford Ka+ rear springs in pairs — a single new spring paired with an old, sagged one on the other side creates an uneven ride height and handling bias.

Ford Ka+ Rear Springs: What It Does

The Ford Ka+'s rear coil spring supports the weight of the car's rear end and absorbs the initial impact of a bump, working alongside the shock absorber rather than replacing its function. A sagged or broken spring lowers ride height, can affect headlight aim, and in severe cases is an MOT failure item.

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Ford Ka+ Rear Springs: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Rear Springs Guide for symptoms of a failing spring, confirming fitment against your VIN, and OEM vs aftermarket guidance.

More Ford Rear Springs

The same part, covered across other Ford models.