MOT comparison

Mercedes-Benz C-Class W205 vs Audi A4 B9

How the Mercedes-Benz C-Class W205 (4th Gen) (2014–2021) and the Audi A4 B9 (2016–2026) do at their MOTs, compared at the same mileage so a high-mileage car is never measured against a low-mileage one.

Mercedes-Benz C-Class W205 (4th Gen)

1,207,528

MOT tests compared · built 2014–2021

Passes more often in 0 of 13 mileage bands

Audi A4 B9

376,994

MOT tests compared · built 2016–2026

Passes more often in 7 of 13 mileage bands

MOT pass rate by mileage

Share of MOTs passed first time, at the mileage recorded at the test.

Mercedes-Benz C-Class W205 Audi A4 B9

Under 10,000 miles 94.9% vs 94.7%

16,154 and 3,440 MOTs

10,000–20,000 miles 91.3% vs 92.1%

90,994 and 26,676 MOTs

20,000–30,000 miles 89.0% vs 89.5%

166,058 and 55,627 MOTs

30,000–40,000 miles 86.9% vs 87.4%

182,203 and 63,090 MOTs

40,000–50,000 miles 84.8% vs 85.7%

167,632 and 57,224 MOTs

50,000–60,000 miles 83.0% vs 83.9%

143,755 and 47,204 MOTs

60,000–70,000 miles 81.4% vs 82.5%

116,791 and 37,104 MOTs

70,000–80,000 miles 80.1% vs 81.8%

91,569 and 27,938 MOTs

80,000–90,000 miles 79.4% vs 81.0%

69,265 and 19,737 MOTs

90,000–100,000 miles 78.3% vs 80.2%

51,226 and 13,746 MOTs

100,000–125,000 miles 77.5% vs 79.7%

71,263 and 17,079 MOTs

125,000–150,000 miles 77.0% vs 78.3%

29,116 and 6,032 MOTs

150,000–175,000 miles 76.5% vs 79.5%

11,502 and 2,097 MOTs

Parts that fail more often

Only differences that hold across at least half of the mileage bands we could compare, and that are far too large to be chance, are listed. How we decide

Mercedes-Benz C-Class W205 fails more often on

Front coil spring

Fails over 20 times as often as the Audi A4 B9: 1.6% of MOTs against 0.01%.

In 10 of 13 mileage bands · Springs & Shocks
Front lower suspension arm

Fails about 9 times as often as the Audi A4 B9: 1.7% of MOTs against 0.23%.

In 9 of 13 mileage bands · Suspension & Joints
Engine management light

Fails about 3 times as often as the Audi A4 B9: 1.7% of MOTs against 0.82%.

In 9 of 13 mileage bands · Dashboard Warning Lights

Audi A4 B9 fails more often on

Rear coil spring

Fails over 20 times as often as the Mercedes-Benz C-Class W205: 3.5% of MOTs against 0.19%.

In 11 of 13 mileage bands · Springs & Shocks

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These are differences in real MOT results, not engineering verdicts. Owner mix differs between models (some are more often taxis, first cars or rural cars), which is why every figure compares cars at the same mileage. How we compare cars.

MOT records: DVSA MOT history, which contains public sector information licensed under the Open Government Licence v3.0. See this the other way round.