2015 Citroen C3 diesel: common problems and MOT failures

What goes wrong more than usual on a 2015 Citroen C3 diesel?

Parts flagged at MOT more often on the 2015 Citroen C3 diesel than on all cars registered in 2015.

• Exhaust system6.6× usual
  Citroen C3

  15.2% All 2015 cars

  2.3%

  Failed outright at MOT: 2.7%, against 0.6% of all 2015 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.

• Brake discs1.9× usual
  Citroen C3

  24.1% All 2015 cars

  12.5%

  Failed outright at MOT: 2.4%, against 0.9% of all 2015 cars. The rest were advisories or minor defects.

  Rough price £150–£350 our estimate

  At the viewing: Look through the wheel at the brake disc: a deep lip at the edge or heavy scoring means they're worn. Feel for judder when braking.

• Drive shaft (CV) joints4.5× usual
  Citroen C3

  7.7% All 2015 cars

  1.7%

  Failed outright at MOT: 6.2%, against 1% of all 2015 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.

• Brake lights3.7× usual
  Citroen C3

  7.4% All 2015 cars

  2%

  Failed outright at MOT: 7%, against 1.6% of all 2015 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.

• Number plate lights2.4× usual
  Citroen C3

  8.3% All 2015 cars

  3.5%

  Failed outright at MOT: 2.6%, against 1.1% of all 2015 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 2015 Citroen C3 diesel MOT failures and advisories

The share of 2015 Citroen C3 diesel MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

• Tyres
  32% 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
  30% 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.

• Lights and electrics
  26% 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
  16% 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
  15% 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
  8% of testsRough price £60–£350

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

Known faults on the 2015 Citroen C3 diesel

Reported by owners, mechanics and buying guides for this model and age. Check which engine the car has, as some apply to one engine only.

• Alternator failure

  All engines

  Headlights that brighten and dim are an early sign of a failing alternator, which will then flatten the battery.

  At the viewing: Watch the lights with the engine idling, and ask whether the battery keeps going flat.

  If it needs doing: Alternator, about £150–£400. ClickMechanic

  Source: Haynes: Citroen C3 Mk2 common problems

• Brake light switch

  All engines

  A faulty brake light switch can leave the brake lights on or stop cruise control working.

  At the viewing: Ask someone to watch the brake lights as you press and release the pedal.

  Source: Haynes: Citroen C3 Mk2 common problems

• Seized handbrake

  All engines

  The rear drum handbrake lever can seize, so the handbrake won't hold or won't release fully.

  At the viewing: Test that the handbrake holds the car on a slope and releases cleanly.

  Source: Haynes: Citroen C3 Mk2 common problems

Questions to ask the seller before buying a 2015 Citroen C3 diesel

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

1. Has the alternator or battery been replaced?
2. Have there been any warning lights?
3. When were the rear brakes last done?
4. Any recent work on the exhaust system? (Flagged at MOT 6.6× as often on the 2015 Citroen C3 diesel as on other cars the same age.)
5. Any recent work on the brake discs? (Flagged at MOT 1.9× as often on the 2015 Citroen C3 diesel as on other cars the same age.)
6. Any recent work on the drive shaft (cv) joints? (Flagged at MOT 4.5× as often on the 2015 Citroen C3 diesel as on other cars the same age.)