2009 Mercedes-Benz SLK 3.5L Petrol · M444 CJX
2009 Mercedes-Benz SLK (3.5L, petrol). First registered 06 Mar 2009. Recorded mileage 100,329 miles. MOT valid until 11 May 2027.
- Make & Model
- MERCEDES-BENZ SLK
- Year / Origin
- 2009 · Manchester
- Safety Recall
- Unknown
- MOT Status
- Valid until 11 May 2027
- Road Tax
- —
- Recorded Mileage
- 100,329 mi
- ULEZ Compliance
- ULEZ Compliant (Euro 4+)
- Fuel & Engine
- Petrol · 3.5L
- 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.
M444 CJX Key Findings
- 5 MOT tests recorded
- Latest MOT passed on 13/05/2026
- 100,329 miles recorded at latest MOT
- 1 historical MOT failure
- No defects recorded at the latest MOT
Derived directly from the recorded DVSA and DVLA data shown on this page.
M444 CJX MOT History
Interpretation generated from the recorded test data above — not an official DVSA statement and not a substitute for an independent inspection.
5 MOT tests are recorded for this 2009 Mercedes-Benz Slk (M444 CJX) between March 2023 and May 2026.
The record contains 4 passes and 1 failure.
The most recent test on 13 May 2026 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 (1 issue). Repeated mentions in one area can indicate an ongoing pattern worth checking in person.
Recorded failure items include: “Nearside Front Coil spring fractured or broken (5.3.1 (b) (i))”.
M444 CJX Mileage History
- 06/03/202394,559 mi
- 02/05/202498,554 mi+3,995 mi
- 08/05/202498,555 mi+1 mi
- 13/05/202599,611 mi+1,056 mi
- 13/05/2026100,329 mi+718 mi
Average of roughly 1,811 miles per year across 5 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: Good
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.
Vehicle & Plate History
Previous plates for this vehicle
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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 2009 model year cars.
- 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.
- 7G-Tronic Automatic Transmission Conductor Plate FailureModerate
The 722.9 7G-Tronic 7-speed automatic gearbox fitted to six-cylinder R171 SLKs features an electro-hydraulic conductor plate (VGS unit) submerged in hot automatic transmission fluid. Over time, thermal cycling and metallic sediment cause the integrated turbine and output speed sensors (Y3/8n1 and Y3/8n2) to fail, triggering diagnostic codes P0717, P0718, or P0705. When the signal drops, the transmission defaults into emergency limp-home mode, locking the gearbox into 2nd gear or reverse until restarted. Independent specialists can rebuild the plate, saving the cost of a brand new SCN-coded valve body.
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