2006 BMW 730d: common problems and MOT failures

What goes wrong more than usual on a 2006 BMW 730d?

Parts flagged at MOT more often on the 2006 BMW 730d than on all cars registered in 2006.

• Engine oil leaks2.1× usual
  BMW 730d

  25.7% All 2006 cars

  12.4%

  Failed outright at MOT: 0.4%, against 0.3% of all 2006 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.

• Suspension arm bushes and joints1.9× usual
  BMW 730d

  20.5% All 2006 cars

  10.6%

  Failed outright at MOT: 3.5%, against 2.4% of all 2006 cars. The rest were advisories or minor defects.

  Rough price £120–£180 (one arm) ClickMechanic

  At the viewing: Listen for clunks over bumps and feel for the steering wandering. Worn arm bushes show as cracked rubber near the wheels.

• Ball joint2× usual
  BMW 730d

  13% All 2006 cars

  6.4%

  Failed outright at MOT: 4.3%, against 3.1% of all 2006 cars. The rest were advisories or minor defects.

  Rough price £60–£150 (one joint) ClickMechanic

  At the viewing: Listen for knocking over bumps and check the rubber boots behind the wheels aren't split.

• Airbag warning light3.9× usual
  BMW 730d

  5.5% All 2006 cars

  1.4%

  Failed outright at MOT: 5%, against 1.3% of all 2006 cars. The rest were advisories or minor defects.

  Rough price £10–£80 our estimate

  At the viewing: Ask a friend to check every light while you work the switches: indicators, brake lights, fog lights and reversing lights.

• Side repeaters2.1× usual
  BMW 730d

  2.9% All 2006 cars

  1.4%

  Failed outright at MOT: 1.4%, against 0.9% of all 2006 cars. The rest were advisories or minor defects.

  Rough price £10–£80 our estimate

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

Common 2006 BMW 730d MOT failures and advisories

The share of 2006 BMW 730d MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

• Suspension
  42% 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.

• Brakes
  37% 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.

• Tyres
  34% 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.

• Oil and fluid leaks
  27% 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.

• Lights and electrics
  23% of testsRough price £10–£80

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

• Wipers, windscreen and mirrors
  10% of testsRough price £15–£250

  At the viewing: Check for chips in the driver's view, and test the wipers and washers.

Questions to ask the seller before buying a 2006 BMW 730d

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 2.1× as often on the 2006 BMW 730d as on other cars the same age.)
2. Any recent work on the suspension arm bushes and joints? (Flagged at MOT 1.9× as often on the 2006 BMW 730d as on other cars the same age.)
3. Any recent work on the ball joint? (Flagged at MOT 2× as often on the 2006 BMW 730d as on other cars the same age.)
4. Can I see the service history and receipts for any big jobs?