1999 Mercedes-Benz SLK · 6,408 MOT tests
1999 Mercedes-Benz SLK reliability
1999 Mercedes-Benz SLKs fail 31.6% of first MOT tests, 13% fewer MOT fails than the average car its age and mileage, ranking 18 of 20 SLK years (6,408 DVSA tests, 2022 to 2024).
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- first-time fail rate (all Mercedes-Benz SLKs: 25.9%)
- 31.6%
- first-time fail rate (all Mercedes-Benz SLKs: 25.9%)
- fails than cars of the same age and mileage
- 13% fewer
- fails than cars of the same age and mileage
- typical miles at its MOT, aged about 24
- 86,922
- typical miles at its MOT, aged about 24
- MOT tests, 2022 to 2024
- 6,408
- MOT tests, 2022 to 2024
Year on year
1999 against the years either side
- 1998 cars: 11% fewer MOT fails than the average car its age (the 1999 car does better)
- 2000 cars: 21% fewer MOT fails than the average car its age (the 1999 car does worse)
- Weak spot: lights and electrics, 19.6% of tests fail here (23% above cars of the same age and mileage).
- Strong point: body, chassis and structure, 65% fewer fails than comparable cars.
Common problems
What fails on a 1999 Mercedes-Benz SLK
Fail rate by area
- Lights and electrics19.6%
- Brakes7.4%
- Windscreen, wipers and mirrors6.5%
- Suspension4.9%
- Tyres4.4%
- Exhaust, emissions and leaks3.6%
- Body, chassis and structure3%
Average for cars of the same age and mileage
Top failures
Stop lamp not working 4.17%
A failed stop lamp means drivers behind cannot see when you brake, a safety risk that must be fixed.
Position lamp not working 2.29%
A failed position lamp makes the car harder to see in poor light and is illegal, so it must be repaired.
Headlamp beam pattern obviously incorrect 1.84%
A wrongly shaped beam can dazzle other drivers and reduce your own view of the road, so the lamps need correcting.
Wiper blade not clearing windscreen 1.81%
Wipers that do not clear the windscreen reduce visibility in rain, which is a safety risk, so replace them.
Windscreen washer fluid insufficient 1.65%
Washers are not supplying enough liquid, so the windscreen cannot be cleared properly, which is a safety issue.
Rigid brake pipe excessively corroded 1.59%
Badly corroded brake pipes can leak or fail, which can cause a loss of braking, so repair is urgent.
Common advisories
Brake pipes corroded and greasy (12.14%) · Tyre worn close to legal limit (8.99%) · Tyre slightly damaged or cracking (7.43%) · Sub-frame showing corrosion (5.06%) · Coil spring showing some corrosion (4.76%) · Wheel bearing slight play (4.74%)
Other years
Every Mercedes-Benz SLK year
The full picture: Mercedes-Benz SLK reliability. Before you pay for any Mercedes-Benz SLK, a Full Check (£9.99) shows finance, stolen and write-off records the MOT can't.
Source: DVSA anonymised MOT results, 2022 to 2024, class 4 normal tests.
Is a 1999 Mercedes-Benz SLK reliable?
1999 Mercedes-Benz SLKs fail 31.6% of first MOT tests, 13% fewer MOT fails than the average car its age and mileage, ranking 18 of 20 SLK years (6,408 DVSA tests, 2022 to 2024).
What fails on a 1999 Mercedes-Benz SLK MOT?
Most often stop lamp not working (4.17% of tests), position lamp not working (2.29% of tests), headlamp beam pattern obviously incorrect (1.84% of tests).
How many miles should a 1999 Mercedes-Benz SLK have done?
At its MOT aged about 24, a typical 1999 Mercedes-Benz SLK shows 86,922 miles. Much higher or lower is worth asking about.
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