Used buying checklist
BMW Z4 reliability, common problems and used buying checks
A used BMW Z4 looks about average for reliability in UK MOT data: 16.9% of 41,916 tests failed, compared with 18.7% across all indexed models. A good example should have a clean MOT history for corrosion and structure, lights and electrical, and suspension and steering.
It can be, if the exact car has a clean history for corrosion and structure, lights and electrical, and suspension and steering.
Start with corrosion and structure, lights and electrical, and suspension and steering, then compare the car's mileage and recall record below.
Sources used: DVSA MOT tests (Apr 2026); vehicle recalls (Apr 2026); MOT fault wording (May 2025). MOT data does not capture every reliability issue, especially intermittent engine, gearbox or infotainment faults that do not appear during the test.
- 16.9% MOT failure rate
- Median tested mileage 67,380 miles
- 7,088 failed MOT tests analysed
Corrosion and structure is the clearest area to check
Corrosion and structure is the clearest named problem area in this model's MOT history (27.9 MOT notes per 100 tests). Example MOT phrases from this area include excessively corroded, ferrule excessively corroded, and corroded and seriously weakened.
Example MOT phrases to search in the car's history:
- excessively corroded
- ferrule excessively corroded
- corroded and seriously weakened
- corroded so that its cross sectional area is reduced and seriously weakened
- slightly damaged
- inoperative in the case of multiple lamps or light sources
- warning lamp indicates a fault
- lens slightly defective
- ball joint excessively worn
- across an axle
Focus on corrosion and structure, lights and electrical, and suspension and steering
The model's recorded failure rate is 16.9%, -1.8 percentage points compared with the average across all models. Use the seller questions below to check whether repeat MOT notes have actually been repaired.
- MOT tests analysed41,916 tests
- Median tested mileage67,380 miles
- Failed MOT tests7,088
Should you buy a used BMW Z4?
83.1% of the MOT tests we analysed for this model passed. The model's recorded failure rate is 16.9%, -1.8 percentage points compared with the average across all models. This is a buying brief for the exact car in front of you: clean repeat history matters more than badge reputation.
- Repeat unresolved MOT notes for corrosion and structure, lights and electrical, and suspension and steering
- corrosion and structure appearing across more than one MOT
- Any dangerous MOT failure on the exact car, especially if the same area appears again later
- No paperwork showing applicable recall work has been completed
- A seller who cannot explain MOT wording such as "excessively corroded"
It can be, if the exact car has a clean history for corrosion and structure, lights and electrical, and suspension and steering.
Start with corrosion and structure, lights and electrical, and suspension and steering, then compare the car's mileage and recall record below.
Corrosion and structure is the clearest named problem area in the MOT history (27.9 MOT notes per 100 tests). These counts are issue notes, not failure rates, because a single MOT can list several faults.
Past 100k miles on the BMW Z4, MOT records most often point to corrosion and structure, lights and electrical, and emissions, engine, and exhaust.
The MOT failure rate rises from 5.7% at 0-3 years to 21.5% at 15+ years. Compare the car with the nearest age range before treating a fault as normal wear or a warning sign. The average MOT failure rate across all models in the same dataset is 18.7%.
Start with corrosion and structure, lights and electrical, suspension and steering, and emissions, engine, and exhaust. The checklist on this page explains why each area is being recommended, what to inspect, and what to ask the seller.
6 relevant recall notices appear for this model. Treat them as safety checks to verify for the exact car, not as normal MOT wear.
What should I check first?
Start with corrosion and structure, lights and electrical, suspension and steering, and emissions, engine, and exhaust. The checklist on this page explains why each area is being recommended, what to inspect, and what to ask the seller. Each item shows whether it comes from MOT results, recall notices, or a standard used-car check.
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Corrosion and structure Seen in MOT results
Corrosion and structure is one of the most common MOT problem areas for this model (27.9 MOT notes per 100 tests).
What to check: Inspect sills, subframes, mounting points, arches, and underside corrosion advisories.
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Lights and electrical Seen in MOT results
Lights and electrical is one of the most common MOT problem areas for this model (11.8 MOT notes per 100 tests).
What to check: Check every lamp, warning light, horn, battery condition, and dashboard messages.
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Suspension and steering Seen in MOT results
Suspension and steering is one of the most common MOT problem areas for this model (10.1 MOT notes per 100 tests).
What to check: Listen for knocks, check uneven tyre wear, and inspect steering play.
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Emissions, engine, and exhaust Seen in MOT results
Emissions, engine, and exhaust is one of the most common MOT problem areas for this model (9.2 MOT notes per 100 tests).
What to check: Check warning lights, smoke, exhaust leaks, recent emissions failures, and service history.
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Windscreen, wipers, and mirrors Seen in MOT results
Windscreen, wipers, and mirrors is one of the most common MOT problem areas for this model (6.1 MOT notes per 100 tests).
What to check: Check windscreen damage, wiper operation, washers, mirrors, and demisting.
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Tyres and wheels Seen in MOT results
Tyres and wheels is one of the most common MOT problem areas for this model (1.7 MOT notes per 100 tests).
What to check: Check tyre age, tread depth, sidewall damage, wheel condition, and alignment wear.
What changes with mileage?
Past 100k miles on the BMW Z4, MOT records most often point to corrosion and structure, lights and electrical, and emissions, engine, and exhaust.
Common MOT problem areas
Common faults: what usually fails on this model?
Corrosion and structure is the clearest named problem area in the MOT history (27.9 MOT notes per 100 tests). These counts are issue notes, not failure rates, because a single MOT can list several faults.
Recall-related areas to verify
Official recall areas
Manufacturer recall notices for the BMW Z4 mainly involve 5 areas: emissions, engine, and exhaust, lights and electrical, suspension and steering, and mixed recall notices. Treat each as something to verify on the specific car you are viewing; the recall table below shows the official notice text.
Mileage and age checks
Mileage changes: what starts showing up after high mileage?
Past 100k miles on the BMW Z4, MOT records most often point to corrosion and structure, lights and electrical, and emissions, engine, and exhaust. On lower-mileage cars, the most common named areas are corrosion and structure, windscreen, wipers, and mirrors, and lights and electrical.
| Mileage range | Tests | Vehicles | Failure rate (vs all models) | Median mileage |
|---|---|---|---|---|
| 0-50k | 13,568 | 11,759 | 9.8%-1.0 percentage points vs all models | 30,489 miles |
| 50-100k | 19,480 | 15,725 | 18.4%-2.3 percentage points vs all models | 73,542 miles |
| 100-150k | 7,753 | 5,850 | 24.7%-1.5 percentage points vs all models | 115,529 miles |
| 150-200k | 815 | 611 | 26.4%-0.9 percentage points vs all models | 162,495 miles |
| 200k+ | 56 | 38 | 35.7%+9.1 percentage points vs all models | 217,384 miles |
Problem areas by mileage
Past 100k miles on the BMW Z4, MOT records most often point to corrosion and structure, lights and electrical, and emissions, engine, and exhaust.
| Mileage range | Car areas most often recorded | Specific MOT defect examples |
|---|---|---|
| 0-50k |
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| 50-100k |
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| 100-150k |
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| 150-200k |
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| 200k+ |
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Fair comparisons: is this problem normal for its age?
The MOT failure rate rises from 5.7% at 0-3 years to 21.5% at 15+ years. Compare the car with the nearest age range before treating a fault as normal wear or a warning sign. The average MOT failure rate across all models in the same dataset is 18.7%. The highest failure rate by age is 21.5% for 15+ years cars, based on 19,388 tests.
| Age range | Tests | Vehicles | Failure rate (vs all models) | Median age |
|---|---|---|---|---|
| 0-3 years 2023–2026 reg. |
1,349 | 1,238 | 5.7%-2.7 percentage points vs all models | 3.0 years |
| 3-6 years 2020–2023 reg. |
2,751 | 2,324 | 7.8%-2.8 percentage points vs all models | 4.0 years |
| 6-10 years 2016–2020 reg. |
6,515 | 5,473 | 12.4%-4.2 percentage points vs all models | 8.4 years |
| 10-15 years 2011–2016 reg. |
11,913 | 9,863 | 15.3%-8.3 percentage points vs all models | 12.8 years |
| 15+ years pre-2011 reg. |
19,388 | 15,141 | 21.5%-4.4 percentage points vs all models | 17.7 years |
Recall records and data freshness
Recall context: are there safety notices to know about?
6 relevant recall notices appear for this model. Treat them as safety checks to verify for the exact car, not as normal MOT wear.
| 2026-03-02 | Replace the Engine Starter Motor The Safety Recall relates to the engine starter motor. The fault relates to the RSW22 starter RWT (reinforced water tightness). It was found that with RWT starters an increased abrasion of the magnetic contact can cause the growth of deposits at the lowest point of the relay interior. This in turn may increase the relay contact resistance resulting in false starts or even causing short circuits and possibly a thermal reaction. In case of a short circuit the possibility of a thermal event cannot be excluded. This may happen while attempting to start the vehicle or while driving due to vibrations causing a short circuit due to moving deposits. On the affected vehicles the starter motor will be replaced with a variant by another supplier with a different design. Until the repair has been completed it is recommended to not leave the vehicle running unattended after starting the engine. |
|---|---|
| 2024-05-01 | Replace VANOS bolts N51 N52 N55 On affected vehicles overtime the aluminium screws can loosen or break on the adjustable variable camshaft timing (VANOS) units potentially resulting in engine emergency mode being activated. On affected vehicles the eight aluminium screws will be replaced if evidence of faulty screws is found then the VANOS adjustment unit will also be replaced. |
| 2021-03-15 | AFFECTED VEHICLES MAY BE FITTED WITH BRAKE DISCS WHICH ARE NOT TO SPECIFICATION Affected vehicles may be fitted with brake discs which were not produced according to the specifications On the affected vehicles the brake discs will be checked and if necessary replaced |
| 2020-11-30 | ON AFFECTED VEHICLES THERE IS A POSSIBLE FAILURE OF THE FUEL TANK WELDING JOINT WHICH COULD LEAD TO LEAKAGE On affected vehicles there is a possible failure of the fuel tank welding joint which could lead to leakage. Replace the fuel tank |
| 2020-08-10 | STEERING TIE ROD CAN BECOME BROKEN IN THE 'KINK' GROOVE AREA OF THE ROD A steering tie rod with an earlier design configuration can become broken in the �kink� groove area of the rod. Both of the steering tie rods will be replaced on the affected vehicles. |
| 2019-12-09 | THE PRESSING FORCE OF THE BEARING BUSHING INTO THE CRANKCASE MAY BE OUT OF SPECIFICATION The engine counterbalance shaft bearing bushing into the crankcase may be out of specification Replace the engine of affected vehicles |
Related searches
Common ways people look up the BMW Z4. Each link runs the search and lands on the relevant section of this report.
Related reliability guides
See where this model sits against other BMW reports by MOT failure rate and common problem area.
Compare high-confidence model reports across all makes.
Use the fleet mileage baseline before checking this model's own mileage table.
Compare this model's age pattern with the wider MOT baseline.
Sources used: DVSA MOT tests (Apr 2026); vehicle recalls (Apr 2026); MOT fault wording (May 2025). These are patterns from many MOT tests and recall notices. They help you decide what to inspect and what to ask; they do not certify the condition of one specific car.