The BMW Z4 is a two-seat roadster available as a soft-top (E85/E89) and a retractable hardtop (E89). The current G29 Z4 is a joint venture with Toyota (sharing with the Supra). A leisure car rather than a daily driver, mileages tend to be lower than other BMWs.
Quick Facts — BMW Z4
Common Engines
sDrive20i, sDrive30i, M40i, sDrive18i, sDrive20i (E89)
6 Most Common BMW Z4 Problems
These are the faults most frequently seen on the BMW Z4 by UK garages — ranked by how commonly they occur and what they cost to fix.
The E89 Z4's retractable hardtop mechanism can fail — usually a hydraulic pump or switch fault. Roof stuck open or failing to latch fully are the symptoms.
💷 Typical repair cost: £400–£1,500
VANOS variable valve timing rattles are common on N52 petrol engines — a cold-start rattle that disappears as the engine warms.
💷 Typical repair cost: £300–£800
Soft-top Z4 models can develop water ingress through aged hood seals. Wet carpets and electrical issues result.
💷 Typical repair cost: £150–£600
Front lower control arm bushes and ball joints wear on the Z4. Clunking over bumps and vague steering are the symptoms.
💷 Typical repair cost: £200–£500
Window regulators fail on E85 and E89 models. The window drops into the door or stops responding.
💷 Typical repair cost: £100–£250
The Z4's rear exhaust sections corrode on older examples. Increased noise and visible rust are the symptoms.
💷 Typical repair cost: £150–£400
Got a BMW Z4 Fault?
Find Out What It Is — £1.99
Describe your symptoms and MotorLoom cross-references known BMW Z4 fault data — giving you likely causes, UK repair costs and MOT risk instantly.
Run My Diagnostic — £1.99 →
60 seconds · One-time payment · Instant report
BMW Z4 — MOT Tips
Ensure the convertible roof operates and seals fully. Front suspension bushes are a frequent advisory. Check all lights and electrics. Exhaust condition must be checked on older E85 models.
Engine management light on before your MOT? It's an automatic fail. Run a
MotorLoom diagnostic for £1.99 to get the likely cause and repair cost before booking the test.
BMW Z4 Tyres
Most BMW Z4 models run 225/45 R17 or 245/40 R18 depending on trim level and year. Always check the placard inside the driver's door for the exact size for your vehicle.
Summary
The Z4 is a stylish, engaging roadster at competitive used prices. Roof mechanism health is the key check on E89 models. Generally reliable when properly maintained with the expected lower mileages of a leisure car.
If your BMW Z4 has a warning light on or a symptom you can't identify, a MotorLoom diagnostic report for £1.99 gives you likely fault causes, UK repair cost estimates and MOT risk — instantly.
BMW Z4 Warning Light On?
Get Your Report — £1.99
Instant fault analysis, UK repair costs and MOT risk for your exact BMW Z4.
Run My Diagnostic →
One-time £1.99 · No subscription · Instant results
Other BMW Models