Mercedes Benz C 320 (2005)
2005 Mercedes Benz C 320
CarHunch analysed 263 real MOT records for the 2005 Mercedes Benz C 320. This breakdown of actual test outcomes — pass rates, defect profiles, mileage data — isn't published anywhere else.
This 2005 C 320 falls 3.7 percentage points below the UK average with a 76.3% first-time pass rate, and nearly half of these vehicles (46%) have recorded a dangerous defect at some point—a significant reliability red flag for a nearly 20-year-old luxury car. The diesel variant, which makes up the vast majority of the cohort, performs virtually identically to the overall figure at 76.4%, so fuel type isn't a differentiator here.
These cars are averaging around 94,000 miles, which is reasonable for their age, but the real concern emerges in the failure pattern: 4.33 average failures per MOT cycle combined with 24 advisories suggests persistent running issues rather than one-off faults. Before buying, have an independent Mercedes specialist conduct a pre-purchase inspection focusing on suspension, cooling system, and transmission—areas where this generation frequently develops costly problems.
What to check before buying a 2005 Mercedes Benz C 320
Practical pre-purchase checks for this age and model.
- 📋 Check the full MOT history. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. Enter the reg below for a full AI analysis.
- 🔍 Inspect for corrosion in person. Brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that's expensive to fix and can fail an MOT.
- 🛞 Check tyres and brakes. The most common advisory items at this age. Budget for replacement if they're near the limit — factor this into your offer price.
- ⚠️ 46% of these vehicles have had a dangerous defect recorded. Enter the reg below — the full MOT history will show exactly what was flagged and whether it was resolved.
- 📄 Run an HPI check. The MOT history won't show outstanding finance, insurance write-offs, or stolen status — an HPI check will.
Before you buy a Mercedes Benz C 320
MOT history is one piece of the puzzle. These checks can reveal what CarHunch can't.
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Pass Rate by Fuel Type
| Fuel type | Vehicles | Pass rate | Avg failures |
|---|---|---|---|
| Diesel (72%) | 189 | 76.5% | 4.19 |
| Petrol (28%) | 74 | 75.9% | 4.7 |
Mileage Distribution
Most 2005 Mercedes Benz C 320 vehicles sit in the blue band. If the car you're looking at is outside it, it's either unusually low or high mileage for its age.
Half of all 2005 Mercedes Benz C 320 vehicles fall between 76,257 and 116,352 miles.
2005 Mercedes Benz C 320 — Still on the Road
Numbers are declining — 76 vehicles still getting MOTs in 2025 (32% of peak).
Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2014–2025.
MOT History Averages
Found a specific Mercedes Benz C 320?
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