2004 Mazda Bongo diesel: common problems and MOT failures

What goes wrong more than usual on a 2004 Mazda Bongo diesel?

Parts flagged at MOT more often on the 2004 Mazda Bongo diesel than on all cars registered in 2004.

• Rust around suspension or steering mountings3.4× usual
  Mazda Bongo

  21% All 2004 cars

  6.1%

  Failed outright at MOT: 15.8%, against 2.9% of all 2004 cars. The rest were advisories or minor defects.

  Rough price £100–£450 our estimate

  At the viewing: On a straight road the steering wheel should sit straight. Listen for knocks when turning, and check the steering feels even.

• Chassis rust or damage4.5× usual
  Mazda Bongo

  15.8% All 2004 cars

  3.5%

  Failed outright at MOT: 8.8%, against 1.1% of all 2004 cars. The rest were advisories or minor defects.

  Rough price £150–£1,000 our estimate

  At the viewing: Check the sills, wheel arches and underneath for rust, and look along the panels for uneven gaps or paint.

• Body structure rust or damage4.3× usual
  Mazda Bongo

  13% All 2004 cars

  3%

  Failed outright at MOT: 5.3%, against 0.9% of all 2004 cars. The rest were advisories or minor defects.

  Rough price £150–£1,000 our estimate

  At the viewing: Look underneath and along the sills for flaky rust or fresh underseal hiding it.

• Rear fog light7.3× usual
  Mazda Bongo

  11% All 2004 cars

  1.5%

  Failed outright at MOT: 10.7%, against 1.5% of all 2004 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.

• Rust in key structural areas4.3× usual
  Mazda Bongo

  6% All 2004 cars

  1.4%

  Failed outright at MOT: 5.3%, against 1% of all 2004 cars. The rest were advisories or minor defects.

  Rough price £80–£250 our estimate

  At the viewing: Pull each seatbelt sharply. It should lock, and retract cleanly.

Common 2004 Mazda Bongo diesel MOT failures and advisories

The share of 2004 Mazda Bongo diesel MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

• Suspension
  55% 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.

• Lights and electrics
  37% of testsRough price £10–£80

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

• Brakes
  36% 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.

• Rust and bodywork
  32% of testsRough price £150–£1,000

  At the viewing: Check the sills, wheel arches and underneath for rust, and look along the panels for uneven gaps or paint.

• Tyres
  23% 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
  23% 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.

Questions to ask the seller before buying a 2004 Mazda Bongo 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 rust around suspension or steering mountings? (Flagged at MOT 3.4× as often on the 2004 Mazda Bongo diesel as on other cars the same age.)
2. Any recent work on the chassis rust or damage? (Flagged at MOT 4.5× as often on the 2004 Mazda Bongo diesel as on other cars the same age.)
3. Any recent work on the body structure rust or damage? (Flagged at MOT 4.3× as often on the 2004 Mazda Bongo diesel as on other cars the same age.)
4. Can I see the service history and receipts for any big jobs?