EngineHigh
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
- Typical repair
- Timing chain, tensioner & guides · £900–£2,400
Is the 2018–2025 BMW X4 reliable?
Scored from 8 documented faults · reviewed by the VehicleFaults Research Team
Quick answer
4.8/ 10
Buy with cautionOn our documented-fault scoring the BMW X4 rates 4.8 out of 10 · buy with caution. We hold 8 known faults for it and 2 are rated high severity, so the risk is real but contained. The weak points cluster around suspension, tyres and engine. A well-serviced example with evidence for the big-ticket items is usually a safe buy; the score describes the model, not the specific car in front of you.
Verdict · Walk unless the history is spotless
What the score is built from
- Critical
- 0
- High
- 2
- Medium
- 5
- Low
- 1
Weak points cluster around suspension, tyres, engine, electrical.
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Check this carThe faults that decide it
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.
- Typical repair
- Driveline / differential repair · £450–£1,800
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
- Typical repair
- Suspension refresh (per axle) · £250–£1,100
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
- Typical repair
- Tyres & alignment · £180–£700
ElectricalMedium
iDrive and driver assistance camera calibration faults
- Typically appears
- Age-related
- What to inspect
- Test lane assist, cameras and parking sensors
- Typical repair
- Electrical diagnosis & module repair · £120–£900
Costs are indicative UK independent-garage bands for budgeting and negotiation · never a quote.
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