Model Reports 8 min read Updated 12 Jul 2026

Citroen C3 2017: reliability & common MOT faults

Elevated MOT failure patterns for the 2017 Citroen C3 include Exhaust system (front) (~9.3× peers) and Catalyst emissions (~8.3× peers). Based on UK DVSA open data for test year 2025 (4,228 failed first-attempt tests), compared with similar age and mileage peers. Available test years: 2024, 2025.

4,228 failed first-attempt tests · 14,789 first tests (test year 2025)

Standout pattern: Exhaust system (front) — about 9.3× more often than on similar peer cars.

Key takeaways before you buy

  • Exhaust system (front): about 9.3× more often than similar cars
  • Catalyst emissions: about 8.3× more often than similar cars
  • Emissions not tested: about 5.8× more often than similar cars

Common faults

These are MOT failure patterns that show up more often on this registration year than on similar cars of the same class, age band, and mileage in the same test year (leave-one-out peer comparison; whole model family excluded).

Statistical patterns from MOT defect codes — not manufacturer TSBs, recalls, or a diagnosis of any individual car. Fail and advisory patterns are kept separate.

Based on 4,228 failed first-attempt tests in test year 2025.

Exhaust system (front)

This failure pattern appears about 9.3× more often than on similar peer cars — recorded on 201 failed first-attempt tests; 4.8% of failed tests for this model year.

Front · 201 failures · ×9.3 vs similar cars · 4.8% of failed first tests · Strong pattern — appears far more often than similar cars

Catalyst emissions

This failure pattern appears about 8.3× more often than on similar peer cars — recorded on 659 failed first-attempt tests; 15.6% of failed tests for this model year.

Any · 659 failures · ×8.3 vs similar cars · 15.6% of failed first tests · Strong pattern — appears far more often than similar cars

Emissions not tested

This failure pattern appears about 5.8× more often than on similar peer cars — recorded on 112 failed first-attempt tests; 2.6% of failed tests for this model year.

Any · 112 failures · ×5.8 vs similar cars · 2.6% of failed first tests · Strong pattern — appears far more often than similar cars

# Fault pattern Location Failures vs similar cars Share of fails Confidence
1 Exhaust system (front)
Body, chassis, structure > Exhaust system
 Front 201 ×9.3 4.8% Strong pattern — appears far more often than similar cars
2 Catalyst emissions
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Catalyst emissions
 Any 659 ×8.3 15.6% Strong pattern — appears far more often than similar cars
3 Emissions not tested
Noise, emissions and leaks > Exhaust emissions > Spark ignition > Emissions not tested
 Any 112 ×5.8 2.6% Strong pattern — appears far more often than similar cars
4 Registration plate lamp(s)
Lamps, reflectors and electrical equipment > Registration plate lamp(s)
 Any 302 ×4.6 7.1% Likely common fault pattern
5 Registration plate lamp(s) (rear)
Lamps, reflectors and electrical equipment > Registration plate lamp(s)
 Rear 183 ×4.5 4.3% Likely common fault pattern
6 Exhaust system
Body, chassis, structure > Exhaust system
 Any 137 ×4.1 3.2% Likely common fault pattern
7 Drive shafts — Joints (front)
Body, chassis, structure > Transmission > Drive shafts > Joints
 Front 412 ×3.2 9.7% Likely common fault pattern
8 Position lamp (rear)
Lamps, reflectors and electrical equipment > Position lamps > Position lamp
 Rear 127 ×2.7 3.0% Possible elevated fault
9 Side repeaters
Lamps, reflectors and electrical equipment > Direction indicators > Flashing type > Side repeaters
 Any 136 ×2.7 3.2% Possible elevated fault
10 Stop lamp (rear)
Lamps, reflectors and electrical equipment > Stop lamp
 Rear 203 ×2.1 4.8% Possible elevated fault

Only patterns that clear minimum sample and elevation thresholds are shown (at least 20 failures and 2.0× peer lift).

Wear patterns

These patterns look like wear or usage effects rather than model-specific design faults. Tyres, brake friction material, and alignment-related defects often track mileage and road use. They are not treated as a model design fault in our common-faults ranking.

# Pattern Location Failures vs similar cars Share of fails Confidence
1 Brake discs (front)
Brakes > Mechanical brake components > Brake discs and drums > Brake discs
 Front 209 ×2.7 4.9% Wear / usage pattern — not treated as a model design fault
2 Headlamp aim not tested
Lamps, reflectors and electrical equipment > Headlamp aim > Headlamp aim not tested
 Any 41 ×2.4 1.0% Wear / usage pattern — not treated as a model design fault

Advisories

Advisory items recorded on failed first-attempt tests that appear elevated versus peers. Advisories are not a fail rate — they flag issues noted at the test, often before they become failures.

# Advisory pattern Location Notes vs similar cars Share Confidence
1 Anti-roll bar (front)
Suspension > Anti-roll bars > Anti-roll bar
 Front 27 ×15.8 0.6% Possible elevated fault
2 Exhaust system (front)
Body, chassis, structure > Exhaust system
 Front 350 ×9.8 8.3% Strong pattern — appears far more often than similar cars
3 Pins and bushes (front)
Suspension > Anti-roll bars > Pins and bushes
 Front 37 ×6.6 0.9% Likely common fault pattern
4 Exhaust system (rear)
Body, chassis, structure > Exhaust system
 Rear 97 ×5.0 2.3% Possible elevated fault
5 Exhaust system
Body, chassis, structure > Exhaust system
 Any 186 ×4.7 4.4% Likely common fault pattern
6 Individual direction indicators (rear)
Lamps, reflectors and electrical equipment > Direction indicators > Flashing type > Individual direction indicators
 Rear 42 ×3.5 1.0% Possible elevated fault

FAQs

We do not show a single reliability score for the 2017 Citroen C3 on this page. Among 4,228 failed first-attempt MOT tests (test year 2025), Exhaust system (front) appears more often than on similar peer cars (about 9.3× more often than peers; 201 observed failures; 4.8% of failed tests). Treat this as a pre-purchase checklist from DVSA open data — not a guarantee for any individual car.
Among failed first-attempt tests we surface patterns that appear more often than on similar peer cars. Top example: Exhaust system (front) (about 9.3× more often than peers; 201 observed failures; 4.8% of failed tests). These are statistical signals, not a diagnosis of any individual car.
Exhaust system (front) shows up more often than on similar peer cars (about 9.3× more often than peers; 201 observed failures; 4.8% of failed tests). That does not prove a causal design fault — age, mileage, and usage still matter. Treat it as a pre-purchase check point, not a manufacturer TSB.
Common MOT problem areas for the 2017 Citroen C3 include Exhaust system (front), Catalyst emissions, Emissions not tested. These are elevated versus similar peer cars where lift clears our floors — not a full list of every possible fault on an individual car.
Advisories flag issues noted at the test and are not a fail rate. We show advisory patterns that look elevated versus peers among failed first-attempt tests, separate from common failure rows. Use them as early-warning checks, not as a pass/fail score.
This page highlights elevated MOT failure patterns for the 2017 Citroen C3 (registration year) using UK DVSA open data for the selected test year. Patterns are ranked against similar age and mileage peers. It is a buyer checklist from MOT defect statistics — not a full service history or manufacturer TSB list.
No. MOT tests do not cover engine internals, gearboxes, or many electronic modules. Patterns here come from MOT defect statistics only and should not be read as engine or gearbox reliability scores.
PRS means the vehicle failed items that were fixed at the test station and then passed the same day. We count PRS as a first-attempt fail in headline rates so same-day repairs do not hide problems.

About this data

Universe. UK class 4 cars only; normal MOT tests (not retests); results pass, PRS, or fail; one first test per vehicle per calendar year.

PRS policy. PRS means the vehicle failed items that were fixed at the test station and then passed the same day. We count PRS as a first-attempt fail in headline rates so same-day repairs do not hide problems.

Peer baseline. We compare this model year with other class 4 cars of similar age and mileage in the same test year, excluding the whole model family so the car is not compared with itself (leave-one-out peer baseline).

Data years. Test years covered: 2024, 2025.

Limitations.

  • MOT tests do not cover engine internals, gearboxes, or many electronic modules — so this is not a full reliability score.
  • Common faults are inferred from MOT defect statistics, not manufacturer TSBs or recalls.
  • Matching on age and mileage reduces but does not remove every usage or maintenance difference between cars.
  • Pass rates and star scores appear only when those data marts are available; this page never invents them.

Display rules config: 1

Contains public sector information licensed under the Open Government Licence v3.0.

Most reliable Citroen models

See brand-wide MOT rankings and year guidance for Citroen (separate from this model-year report).