2004–2008 Mercedes-Benz SLK (R171)
Browse our directory of 2004–2008 Mercedes-Benz SLK (R171) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.
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Common Problems & Reliability
The 2004–2008 Mercedes-Benz SLK (R171) has 2 known issues. 1 of these are classified as serious faults that could be expensive to repair. 1 are moderate concerns worth inspecting before purchase.
M272 V6 Balance Shaft Wear
SeriousEarly 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.
Symptoms: Engine management light (codes P0016/P0017), Rough idle...
Est. repair cost: £2,500–£4,000
Vario-Roof Hydraulic Leaks
ModerateThe complex folding hardtop uses multiple hydraulic cylinders that can leak as the seals age.
Symptoms: Roof slow to open/close, Hydraulic fluid dripping onto the headlining or in the boot
Est. repair cost: £300–£1,000
Buying Tips for the 2004–2008 Mercedes-Benz SLK (R171)
- ✓Operate the folding "Vario-roof" multiple times to ensure smooth operation and no hydraulic leaks
- ✓Check the boot for dampness, which indicates blocked roof drains or failing seals
- ✓Avoid 2004-2008 SLK 280/350 (M272 V6) models unless there is proof the balance shaft has been replaced
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