IsItAGoodCar

Common Problems with the
2017–2021 Citroën C3 (Mk3)

We've identified 4 known issues that can affect the 2017–2021 Citroën C3 (Mk3). 2 of these are serious faults that could be expensive to repair.

4
Known Issues
2
Serious
1
Moderate
1
Minor

The 2017–2021 period has 3 more issues than the Citroën C3 (Mk3) average across all year periods.

All Known Issues

1.2 PureTech "Wet Belt" Degradation

SeriousEngine

The timing belt runs in oil and can degrade, shedding debris that blocks the oil pickup. This leads to oil starvation, vacuum pump failure, and a dangerous loss of braking assistance (Recall R/2020/331).

Most affected: 1.2 PureTech petrol

Estimated cost: £600–£1,800Affects: 2017–2022Often appears around: 30,000–60,000 miles

Typical symptoms

  • •Low oil pressure warning
  • •Hard brake pedal
  • •Engine fault light
  • •Furry/cracked belt visible through filler cap

What to inspect before you buy

  • ✓Check belt condition via oil filler cap
  • ✓Verify 0W-30/0W-20 oil usage
  • ✓Check recall status

AdBlue Tank and Pump Failure

SeriousFuel System

The AdBlue system on BlueHDi diesels is prone to pump failure, often requiring a full tank replacement.

Estimated cost: £800–£1,300Affects: 2017–2021Often appears around: 50,000–90,000 miles

Typical symptoms

  • •"UREA" warning light
  • •Engine won't start countdown

What to inspect before you buy

  • ✓Check for emissions warning lights

Exhaust Back Box Detachment

ModerateExhaust & Emissions

The exhaust back box support rod or joint can corrode prematurely, causing the muffler to hang low or detach entirely.

Estimated cost: £150–£300Affects: 2017–2022Often appears around: 30,000–60,000 miles

Typical symptoms

  • •Sudden increase in exhaust noise
  • •Rattling or dragging sound from the rear
  • •Exhaust hanging visibly low

What to inspect before you buy

  • ✓Inspect exhaust hangers and joints for heavy corrosion
  • ✓Gently shake the tailpipe to check for security

Reversing Camera Calibration and Faults

MinorElectrics & Electronics

The factory-fitted reversing camera can lose its calibration guide lines or show a misaligned view of the bumper.

Most affected: Flair, Shine, Origins

Estimated cost: £50–£150Affects: 2017–2024

Typical symptoms

  • •Missing parking guide lines
  • •Camera view appears off-centre or zoomed in
  • •Intermittent blank screen when in reverse

What to inspect before you buy

  • ✓Check camera view for clarity and alignment
  • ✓Ensure reversing lights are working (linked to the same circuit)

Buying Tips for the 2017 Citroën C3 (Mk3)

  • ✓CRITICAL: Inspect the PureTech wet belt through the oil filler cap for signs of degradation.
  • ✓Check the touchscreen responsiveness, as it controls almost all interior functions.
  • ✓On diesel models, verify that no AdBlue or "UREA" warning lights are present.
2022 Citroën C3 (Mk3)

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Other Citroën C3 (Mk3) Year Periods

2017–202120222023–2024

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