2007 Mercedes-Benz R-Class diesel: common problems and MOT failures

What goes wrong more than usual on a 2007 Mercedes-Benz R-Class diesel?

Parts flagged at MOT more often on the 2007 Mercedes-Benz R-Class diesel than on all cars registered in 2007.

• Engine oil leaks2.7× usual
  Mercedes-Benz R-Class

  32.2% All 2007 cars

  12.1%

  Failed outright at MOT: 1%, against 0.4% of all 2007 cars. The rest were advisories or minor defects.

  Rough price £80–£600 our estimate

  At the viewing: Look under the engine and where the car is usually parked for fresh oil. Ask whether the leak has been looked at.

• Rigid brake pipes2.3× usual
  Mercedes-Benz R-Class

  25.2% All 2007 cars

  10.9%

  Failed outright at MOT: 3.2%, against 1.9% of all 2007 cars. The rest were advisories or minor defects.

  Rough price £100–£400 our estimate

  At the viewing: Ask to see underneath, or check the MOT advisories: corroded brake or fuel pipes get worse every year and fail the MOT when they do.

• Drive shaft (CV) joints2.4× usual
  Mercedes-Benz R-Class

  16.3% All 2007 cars

  6.8%

  Failed outright at MOT: 4.8%, against 3.1% of all 2007 cars. The rest were advisories or minor defects.

  Rough price £60–£350 our estimate

  At the viewing: Drive slowly on full steering lock in both directions and listen for clicking. Look for split rubber boots behind the front wheels.

• Diesel smoke emissions4.6× usual
  Mercedes-Benz R-Class

  4.1% All 2007 cars

  0.9%

  Failed outright at MOT: 3.7%, against 0.8% of all 2007 cars. The rest were advisories or minor defects.

  Rough price £175–£900 (catalytic converter) ClickMechanic

  At the viewing: Look for smoke when revving the warm engine and for engine or DPF warning lights.

Common 2007 Mercedes-Benz R-Class diesel MOT failures and advisories

The share of 2007 Mercedes-Benz R-Class diesel MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

• Brakes
  45% of testsRough price £150–£350

  At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.

• Oil and fluid leaks
  34% of testsRough price £80–£600

  At the viewing: Look under the engine and on the ground where the car is usually parked for fresh oil or fluid.

• Tyres
  30% of testsRough price £70–£150

  At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.

• Lights and electrics
  30% of testsRough price £10–£80

  At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

• Suspension
  29% of testsRough price £120–£400

  At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.

• Driveshafts and joints
  17% of testsRough price £60–£350

  At the viewing: On full steering lock, drive slowly and listen for clicking from the front wheels.

Questions to ask the seller before buying a 2007 Mercedes-Benz R-Class diesel

Ask before you travel to see it. A seller who knows the car will have answers, and receipts.

1. Any recent work on the engine oil leaks? (Flagged at MOT 2.7× as often on the 2007 Mercedes-Benz R-Class diesel as on other cars the same age.)
2. Any recent work on the rigid brake pipes? (Flagged at MOT 2.3× as often on the 2007 Mercedes-Benz R-Class diesel as on other cars the same age.)
3. Any recent work on the drive shaft (cv) joints? (Flagged at MOT 2.4× as often on the 2007 Mercedes-Benz R-Class diesel as on other cars the same age.)
4. Can I see the service history and receipts for any big jobs?