2020 Vauxhall Insignia diesel: common problems and MOT failures

What goes wrong more than usual on a 2020 Vauxhall Insignia diesel?

Parts flagged at MOT more often on the 2020 Vauxhall Insignia diesel than on all cars registered in 2020.

• Brake pads2× usual
  Vauxhall Insignia

  15.4% All 2020 cars

  7.7%

  Failed outright at MOT: 4.2%, against 1.4% of all 2020 cars. The rest were advisories or minor defects.

  Rough price £75–£175 (one axle) ClickMechanic

  At the viewing: Listen for squealing or grinding when braking, and look through the wheel at how much pad is left.

• Exhaust system13× usual
  Vauxhall Insignia

  2.6% All 2020 cars

  0.2%

  Failed outright at MOT: 0.8%, against 0% of all 2020 cars. The rest were advisories or minor defects.

  Rough price £100–£500 (pipe or section) ClickMechanic

  At the viewing: Listen for blowing or rattling from underneath at idle, and look for black soot around joints.

• Number plates2.3× usual
  Vauxhall Insignia

  2.1% All 2020 cars

  0.9%

  Failed outright at MOT: 0.4%, against 0.2% of all 2020 cars. The rest were advisories or minor defects.

  Rough price £5–£40 our estimate

  At the viewing: Check the number plate lights work and the plates are clean and legal.

Common 2020 Vauxhall Insignia diesel MOT failures and advisories

The share of 2020 Vauxhall Insignia diesel MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

• Tyres
  26% 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.

• Brakes
  20% 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.

• Wipers, windscreen and mirrors
  8% of testsRough price £15–£250

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

• Lights and electrics
  4% of testsRough price £10–£80

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

• Exhaust and emissions
  3% of testsRough price £100–£1,200

  At the viewing: Look for black soot in the tailpipe, listen for blowing from the exhaust and check for engine or DPF warning lights.

• Suspension
  2% 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.

Questions to ask the seller before buying a 2020 Vauxhall Insignia 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 brake pads? (Flagged at MOT 2× as often on the 2020 Vauxhall Insignia diesel as on other cars the same age.)
2. Any recent work on the exhaust system? (Flagged at MOT 13× as often on the 2020 Vauxhall Insignia diesel as on other cars the same age.)
3. Any recent work on the number plates? (Flagged at MOT 2.3× as often on the 2020 Vauxhall Insignia diesel as on other cars the same age.)
4. Can I see the service history and receipts for any big jobs?