2004 Mercedes-Benz SLK 1.8L Petrol · N99 XAT
2004 Mercedes-Benz SLK (1.8L, petrol). First registered 13 Jul 2004. Recorded mileage 78,790 miles. MOT expired on 14 Sept 2023. Currently declared SORN.
- Make & Model
- MERCEDES-BENZ SLK
- Year / Origin
- 2004 · Newcastle
- Safety Recall
- Unknown
- MOT Status
- Expired on 14 Sept 2023
- Road Tax
- SORN
- Recorded Mileage
- 78,790 mi
- ULEZ Compliance
- Check Required (Pre-Euro 4 Petrol)
- Fuel & Engine
- Petrol · 1.8L
- Reliability Guide
- Common Faults
Thinking of buying this vehicle? Free MOT and tax checks do not cover legal ownership. If outstanding finance exists, finance companies have legal right to repossess without compensation.
N99 XAT Key Findings
- 2 MOT tests recorded
- Latest MOT passed on 16/09/2022
- 78,790 miles recorded at latest MOT
- 1 historical MOT failure
- No defects recorded at the latest MOT
- Recurring suspension items (7 mentions)
Derived directly from the recorded DVSA and DVLA data shown on this page.
N99 XAT MOT History
Interpretation generated from the recorded test data above — not an official DVSA statement and not a substitute for an independent inspection.
2 MOT tests are recorded for this 2004 Mercedes-Benz Slk (N99 XAT) between August 2022 and September 2022.
The record contains 1 pass and 1 failure.
The most recent test on 16 September 2022 was a pass, although the earlier record includes 1 failure that buyers may want to investigate.
Across all tests, the most frequently flagged areas are: Suspension (7 issues), Exhaust & Emissions (1 issue), Lighting (1 issue). Repeated mentions in one area can indicate an ongoing pattern worth checking in person.
In total 6 advisory notices are recorded. Advisories flag items that passed but may need attention before the next test; they are not evidence of how well the vehicle has been serviced.
Recorded failure items include: “Offside Front Lower Suspension arm ball joint dust cover no longer prevents the ingress of dirt x2 (5.3.4 (b) (ii))”; “Rear Sub-frame corroded and seriously weakened (5.3.3 (b) (i))”; “Offside Front Lower Suspension arm ball joint excessively worn (5.3.4 (a) (i))”.
N99 XAT Mileage History
- 31/08/202278,576 mi
- 16/09/202278,790 mi+214 mi
Average of roughly 4,872 miles per year across 2 recorded odometer readings.
Technical Specifications
Core Specifications
Identification & Status
Dimensions & Weights
Diagnostic & Valuation Intelligence
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Known faults for Mercedes-Benz Mercedes-Benz SLK (R171)
Our database tracks 6 specific mechanical faults and recurring failure patterns identified across UK MOT testing stations for this generation.
MOT Roadworthiness: Below Average
This rating reflects historical MOT pass rates and recurring advisory wear patterns from official DVSA test logs. Note that roadworthiness does not verify outstanding finance, insurance write-offs, or stolen records.
Verify lender finance agreements, insurance write-offs, police stolen registers, and mileage rollback.
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MERCEDES-BENZ SLK Model Intelligence & Reliability
Verified MOT failure trends, buying advice, and technical directory specifications.
Owner-reported defects, recurring MOT failure points, and estimated repair costs.
Browse production generations, registration statistics, and trim variants.
Historical MOT pass rates and DVLA records for 2004 model year cars.
- M272 V6 Balance Shaft WearSerious
Early 3.0L and 3.5L V6 engines used soft metal gears on the balance shaft. The gears wear down, altering engine timing and requiring a massive engine-out repair.
- Vario-Roof Hydraulic LeaksModerate
The complex folding hardtop uses multiple hydraulic cylinders that can leak as the seals age.
- Rear Subframe Corrosion and PerforationSerious
The pressed-steel multi-link rear subframe on the R171 SLK is highly prone to severe internal corrosion, aggravated by decades of wet UK winter roads and road salt. Moisture and grime accumulate inside the hollow box sections, rusting the subframe from the inside out until structural perforation occurs around the suspension control arm mounting points. In severe cases, an arm mount shears off entirely, causing sudden dangerous rear-wheel steering and an immediate MOT failure. Mercedes-Benz UK has historically assessed replacements under goodwill on a case-by-case basis.
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