SuspensionMedium
Front control arm bush knock over broken surfaces
- Typically appears
- 50,000+ miles
- What to inspect
- Drive a rough road and listen for a knock at low speed
2018–2025 BMW X4 · common problems & known faults
A coupe SUV bought on style, so tyres, brakes and suspension take the abuse buyers overlook.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed August 2026
Quick answer
The most commonly reported faults on the 2018–2025 BMW X4 are Timing chain and turbo actuator faults on diesels, Juddering or binding sensation from the transfer case during tight turns and Front control arm bush knock over broken surfaces. 2 of the documented issues are rated high severity · inspect these first. Full inspection points, onset mileage and what to check are listed below.
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Build the inspection planReliability snapshot
Based on the documented faults on this page for the BMW X4.
4.8/ 10
- Critical
- 0
- High
- 2
- Medium
- 5
- Low
- 1
Guidance only · reflects reported patterns, not a specific car's condition.
BMW X4 problems by year
Which faults an average example has usually reached depends on its age. Pick a model year for the faults that matter on that build.
Known faults to check
TyresMedium
Uneven wear from run flats and wide rear rubber
- Typically appears
- 20,000+ miles
- What to inspect
- Measure tread inner and outer on all four corners
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Build the inspection planEngineHigh
Timing chain and turbo actuator faults on diesels
- Typically appears
- 80,000+ miles
- What to inspect
- Cold start and check for boost hesitation on the road
ElectricalMedium
iDrive and driver assistance camera calibration faults
- Typically appears
- Age-related
- What to inspect
- Test lane assist, cameras and parking sensors
Engine CoolingMedium
Slow coolant loss and white crust around the expansion tank seams.
- Typically appears
- 40,000-60,000 miles
- What to inspect
- Open the bonnet and inspect the black plastic coolant expansion tank for dried, chalky white residue along the factory seams.
DrivetrainHigh
Juddering or binding sensation from the transfer case during tight turns.
- Typically appears
- 50,000+ miles
- What to inspect
- Perform a tight figure-of-eight manoeuvre at walking pace on full lock; feel for any hesitation, skipping, or stepping sensation from the driveline.
Body ElectricalMedium
Active kidney grille shutters stuck, potentially triggering a check engine light.
- Typically appears
- 3-5 years
- What to inspect
- Start the engine from cold and set the air conditioning to maximum; observe the front kidney grilles to ensure the plastic slats open smoothly.
Exhaust SystemLow
Metallic rattling noise from the rear silencer on cold start.
- Typically appears
- 30,000-50,000 miles
- What to inspect
- Start the vehicle from cold, stand at the rear, and listen for a distinct metallic vibration from the exhaust flap actuator before the idle drops.
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Build my inspection planFrequently asked questions
Is the X4 a safe used buy?
Yes with service history and honest tyre wear.
What do buyers complain about most?
Ride harshness and premature tyre wear on large wheels.
Any expensive surprise?
Chain work on high mileage diesels.
Which engine is the most reliable choice for the UK market?
The B58 3.0-litre petrol in the M40i is widely regarded as the most robust powertrain, provided it receives punctual servicing. For diesel buyers, the B47 2.0-litre in the xDrive20d is dependable but requires regular long motorway runs to prevent DPF and EGR blockages, which are common with urban use.
Does the G02 X4 require specific tyre replacements for the xDrive system?
Yes, it is critical to fit BMW star-marked tyres and replace them in sets or axles to maintain identical rolling radiuses. Tread depth differences exceeding 2mm between the front and rear axles can cause severe wind-up in the VTG transfer box, leading to premature and costly drivetrain failure.
Are there any common water ingress points to check before retail?
The panoramic sunroof drains are prone to blocking with leaves and debris. Water typically overflows into the headlining or runs down the A-pillars into the front footwells. Always lift the front carpets to check for dampness and inspect the boot floor cavities where sensitive electronic modules are housed.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.
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