Common problems

BMW Z3 electrical and lighting problems

How often MOT testers find lights and electrics faults on the BMW Z3 at each age, against all cars of the same age, and which items come up most. From 36,516 DVSA MOT tests taken 2022 to 2025.

MOT data updated 28 September 2026

At 24 years, the most tested age

Lights and electrics fails per 100 MOTs (n=9,582)11.4

All cars at 24 years (n=428,815)17.2

Lights and electrics advisories and minor defects per 100 MOTs (n=9,582)10.0

All cars, same age (n=428,815)12.5

What stands out

At 24 years, 11.4 of every 100 MOTs of the BMW Z3 found a lights and electrics fail (n=9,582), against 17.2 for all cars of that age (n=428,815).
It is level with or below the all-car rate at every age with at least 1,000 tests.
The gap is widest at 21 years: 12.1 per 100 MOTs against 20.6 for all cars.
The lights and electrics fail item recorded most often at 24 years: side/position light not working, on 3.3 per 100 MOTs.
The most common lights and electrics advisory or minor defect: headlamp: lens slightly defective, on 2.5 per 100 MOTs.

Lights and electrics fails by age

Solid line: this model. Dashed line: all cars at the same age.

BMW Z3: lights and electrics fails and advisories per 100 MOTs, by age, against all cars. Ages with fewer than 1,000 tests are not shown.
Age	Tests (n)	Fails	All cars	Advisories	All cars
20 years	1,290	13.3	21.2	8.8	17.4
21 years	3,227	12.1	20.6	10.7	16.7
22 years	5,181	11.2	19.7	9.7	15.5
23 years	8,000	11.3	18.6	9.2	14.2
24 years	9,582	11.4	17.2	10.0	12.5
25 years	9,236	11.5	16.3	9.4	11.1

Lights and electrics fail items at 24 years

Lights and electrics fail items on the BMW Z3 at 24 years (n=9,582), per 100 MOTs, with all cars at the same age (n=428,815).
Item	Per 100 MOTs	All cars	Typical repair (estimate)
Side/position light not working	3.3	3.8	£10 to £47 per lamp
Brake light not working	1.6	2.9	£10 to £47 per lamp
Headlamp aim: too low	1.5	1.8	£16 to £39 per car (rough guide)
Headlamp aim: projected beam image is obviously incorrect	1.2	2.2	£16 to £39 per car (rough guide)
Headlight aimed too high	1.1	1.2	£16 to £39 per car (rough guide)

Lights and electrics advisories and minor defects at 24 years

Advisories and minor defects are recorded, but the car still passes. Across all cars, a part with an advisory or minor defect failed at the next MOT 5.5 times in 100 (n=88,666,940 pairs of consecutive MOTs), against 0.3 times in 100 when the same part had none (n=12,936,860,350).

Lights and electrics advisories and minor defects on the BMW Z3 at 24 years (n=9,582), per 100 MOTs, with all cars at the same age (n=428,815).
Item	Per 100 MOTs	All cars	If it needs replacing (estimate)
Headlamp: lens slightly defective	2.5	2.2
Registration plate lamp(s): inoperative in the case of multiple lamps or light sources	2.3	4.2
Headlamp: has a product on the lens but not seriously reducing light output	1.7	1.7	£28 to £98 per lamp (rough guide)

Repair estimates are a guide for an independent garage: labour at the national median local garage rate (median £78 an hour from 65 garages, ONS price quotes) times estimated labour hours, plus a parts band. Labour hours and most parts bands are estimates, not quotes, and prices vary by model, engine and region. A warning light fault shows the cost of the diagnosis only.

What to check on a viewing

On the BMW Z3, the lights and electrics items testers fail most are side/position light not working; brake light not working; headlamp aim: too low.

With someone outside, try every light: dipped and main beam, indicators, brake lights, fog lights and number plate lamps.
Check that the warning lights come on with the ignition and go out once the engine runs.
Look for misted, cracked or yellowed headlamp lenses.

Ask for the car's MOT history: a lights and electrics advisory that repeats from year to year has not been fixed. GOV.UK MOT history.

Questions

What are the common electrical and lighting problems on the BMW Z3?

At 24 years (9,582 MOTs), the lights and electrics fail items testers record most often are side/position light not working (3.3 per 100 MOTs), brake light not working (1.6 per 100 MOTs), headlamp aim: too low (1.5 per 100 MOTs). The most common lights and electrics advisories or minor defects are headlamp: lens slightly defective (2.5) and registration plate lamp(s): inoperative in the case of multiple lamps or light sources (2.3).

Does the BMW Z3 have more electrical and lighting problems than other cars?

At 24 years it has 11.4 lights and electrics fails per 100 MOTs against 17.2 for all cars of the same age (5.8 fewer). It is level with or below the all-car rate at every age with enough tests.

What does a lights and electrics repair cost on the BMW Z3?

For side/position light not working, an independent garage estimate is £10 to £47 per lamp. This is a guide built from the national median garage labour rate and estimated labour hours, not a quote.

Electrical and lighting problems on other BMW models

Read this with care. A fail rate is not a measure of build quality. How far cars are driven, how they are used and how well owners maintain them all change it, and wear items such as tyres and brake pads are common fails. Compare a model only with cars of the same age. Methodology and limits.

The all cars figures cover all class 4 vehicles (cars and light vans) tested at the same age.

Looking at a BMW Z3?

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Repair estimates: ONS consumer price quotes for local garage labour (09/2025 to 08/2026), the MOT inspection manual for defect wording, and estimated labour hours and parts bands. Not affiliated with or endorsed by ONS.

Source

Contains public sector information licensed under the Open Government Licence v3.0. Source: DVSA anonymised MOT test data, class 4 normal MOT tests, 2022 to 2025. MOT data updated 28 September 2026.

Not affiliated with or endorsed by DVSA. How we calculate these figures · Data sources