BMW X3 Front Suspension Strut: Specs, Fitment & Common Faults

On the X3, a persistent front knock isn't always the strut — a genuinely useful light braking test can help rule out a common, cheaper alternative first.

Generation covered: this guide is for the third-generation X3 (G01, 2018–present), with particular focus on 2018–2023 registered examples now old enough for parts to be a common search. Check your logbook or VIN if you're unsure which generation you have.

Illustration of a suspension strut and coil spring

Illustration for editorial purposes

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OEM Part Number: 31306890943 (front strut, as quoted in catalogue listings — confirm via VIN) — aftermarket struts Sachs 318 344

Accuracy note: Covers the BMW X3 (G01 2018 on) as listed in the UK aftermarket catalogues. Front struts, lower arms and top mounts are sold by side and by suspension spec — standard, sport / lowered (S line, M Sport, R-Line, ST-Line etc.), heavy-duty and adaptive / electronic damping all use different part numbers, and some makers split by engine or front axle load. The references below are UK aftermarket catalogue listings for this generation, labelled by brand; genuine numbers are shown only where a listing quotes one. Confirm the fit against your VIN, and replace struts and top mounts in pairs.

Front strut / shock absorber (aftermarket)	Sachs 318 344 (LH) / 318 345 (RH) (twin-tube gas strut); Sachs 318 346 (LH) / 318 347 (RH) (twin-tube gas strut); TRW JGM1451SL (LH, gas strut, pair JGM1451SR); Maxgear 11-1279 (LH) / 11-1280 (RH) (twin-tube gas); Kavo Parts SSA-11514 (LH) / SSA-11513 (RH) (twin-tube gas); NTY A-BM-060 (RH, electronically adjustable, for VDC cars)
Front lower arm / wishbone (aftermarket)	LH Lemförder 39984 01 / RH Lemförder 39985 01 (front, steel); LH Lemförder 42432 01 / RH Lemförder 42433 01 (rear lower); LH Meyle 316 050 0157/HD / RH 0158/HD (aluminium, ball joint, replace in pairs); LH Mapco 55630 / RH Mapco 55631 (375 mm, 19.1 mm cone, ball joint); LH Vaico V20-7403 / RH V20-7402 (steel)
Top mount / strut bearing (aftermarket)	Lemförder 43690 01 (L/R, with ball bearing); Lemförder 43688 01 and 43689 01 (L/R); Sachs 803 411 (position not stated); febi 193842 (elastomer, with ball bearing); febi 197432 (elastomer, no ball bearing); Meyle 300 313 3601 (rubber-metal, with bearing, pairs); KYB SM1003 (mounting kit)
Genuine (OE) numbers quoted	Sachs 803 411 and Lemförder 43688 01 top mounts quote 31 30 8 067 439 and 8 067 439; Lemförder 43689 01 quotes 31 30 6 888 323; Lemförder 43690 01 quotes 31 30 6 888 324; Lemförder 27001 01 quotes 1 094 616 and 31 33 6 752 735; Japanparts MM-01247 strut (LH) quotes 31306890943
Fitment notes	adaptive (VDC) struts are listed separately from standard ones.

M and higher-output variants use genuinely different suspension geometry and stiffer components than standard trims. Both RWD and xDrive versions of the same trim can be specified with M Sport suspension, so drivetrain alone doesn't determine which strut you need — confirm your exact option codes before ordering.

BMW X3 Front Suspension Strut: The System That Quietly Does All the Work

On the BMW X3, every bump, pothole and corner passes through these components before you ever feel it in the cabin, which is exactly why wear here shows up as vague, hard-to-pin-down symptoms rather than one obvious failure. A methodical check usually finds the culprit faster than guesswork.

Before you buy: suspension components vary by trim, engine weight and whether your car has the standard or sport-tuned setup. Always confirm against your VIN before ordering.

BMW X3 Front Suspension Strut: What It Does

The BMW X3's front suspension strut combines a shock absorber with the coil spring mounting point in one assembly, controlling how quickly the suspension compresses and rebounds over bumps. A worn strut lets the car bounce excessively after a bump instead of settling quickly, and can accelerate uneven tyre wear if left unaddressed.

BMW X3 Front Suspension Strut: Watch: Replacing It

🎬 Watch: Shock Absorber / Strut & Strut Mount Replacement BMW X3 (11-2017)

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A Genuinely Important Finding Worth Knowing — BMW X3 Front Suspension

If a persistent knock at the front has proven genuinely difficult to pin down, this is genuinely worth knowing: a confirmed finding from independent specialists shows that a knock specifically when braking lightly from low speeds is one of the most consistent indicators of worn front lower control arm bushes on related BMW models, a common wear pattern as mileage builds. A deliberate light braking test is a standard check used by independent specialists during a pre-purchase inspection, worth trying this specific test yourself.

A genuinely alarming, honest finding worth knowing: a service bulletin specifically addressing front axle cracking and creaking noises was reportedly issued by the manufacturer for related models, only to be subsequently removed from public access.

It's also genuinely worth knowing that on a genuinely brand new car, a removable shipping clip designed to prevent the strut from compressing during transport not being removed has, in documented cases, been the actual cause of a rattling noise.

BMW X3 Front Suspension Strut: Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Front Suspension Strut Guide for symptoms of worn bushings and ball joints, confirming fitment against your VIN, and rubber vs polyurethane guidance.

More BMW Front Suspension Strut

The same part, covered across other BMW models.