2011 London Taxis INT TX4 diesel: common problems and MOT failures

What goes wrong more than usual on a 2011 London Taxis INT TX4 diesel?

Parts flagged at MOT more often on the 2011 London Taxis INT TX4 diesel than on all cars registered in 2011.

• Engine oil leaks2.1× usual
  London Taxis INT TX4

  15.1% All 2011 cars

  7.2%

  Failed outright at MOT: 0.9%, against 0.2% of all 2011 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.

• Ball joint2.1× usual
  London Taxis INT TX4

  11.7% All 2011 cars

  5.7%

  Failed outright at MOT: 7.6%, against 3.1% of all 2011 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.

• Track rod ends2.3× usual
  London Taxis INT TX4

  10.4% All 2011 cars

  4.6%

  Failed outright at MOT: 6.8%, against 2.4% of all 2011 cars. The rest were advisories or minor defects.

  Rough price £50–£150 (one end, plus about £30–£50 if it needs a wheel alignment) ClickMechanic

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

• Steering boxnull× usual
  London Taxis INT TX4

  4.2% All 2011 cars

  0%

  Failed outright at MOT: 0.9%, against 0% of all 2011 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.

Common 2011 London Taxis INT TX4 diesel MOT failures and advisories

The share of 2011 London Taxis INT TX4 diesel MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

• Suspension
  34% 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
  27% 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
  24% 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
  17% 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
  16% 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.

• Steering
  7% of testsRough price £100–£450

  At the viewing: On a straight road the steering wheel should sit straight. Feel for play or knocking when turning.

Questions to ask the seller before buying a 2011 London Taxis INT TX4 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 2.1× as often on the 2011 London Taxis INT TX4 diesel as on other cars the same age.)
2. Any recent work on the ball joint? (Flagged at MOT 2.1× as often on the 2011 London Taxis INT TX4 diesel as on other cars the same age.)
3. Any recent work on the track rod ends? (Flagged at MOT 2.3× as often on the 2011 London Taxis INT TX4 diesel as on other cars the same age.)
4. Can I see the service history and receipts for any big jobs?