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Peugeot 308 exhaust, emissions and leaks problems

DVSA MOT tests 2022–2025 · 52,033 MOT tests · Updated

At 9 years, 2.9 in 100 MOT tests of the Peugeot 308 failed on exhaust, emissions and leaks, against 2.4 for all class 4 vehicles the same age (all test years; 52,033 MOT tests) [1].

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  • Against all class 4 vehicles the same age: about average for all class 4 vehicles the same age (all test years), 1,514 MOT tests with a fail
  • When it starts: clear of 1.2 times from 12 years and at every older age seen
  • Most common fail: Malfunction indicator lamp: inoperative or indicates a malfunction, 0.7 per 100 MOT tests

Figures are for the model as a whole, not for one car.

What the MOT tests show

What we know

2.9 fails per 100 MOT tests at 9 years, against 2.4 for all class 4 vehicles tested at 9 (all test years). That is about average.

Why it matters

An exhaust, emissions and leaks fail stops the car passing until it is fixed; the most common one is rated major by DVSA.

What to check

Start the car from cold and look for smoke at the exhaust, listen for blowing joints, and look under the engine and gearbox for fresh oil or fluid drips.

Peugeot 308 exhaust, emissions and leaks fails by age

Peugeot 308 exhaust, emissions and leaks fails per 100 MOT tests by ageSolid line: the Peugeot 308. Dashed line: all cars the same age. The table below lists every value.05103 years: 0.5 per 100 (all cars 0.5), 16,624 MOT tests34 years: 0.8 per 100 (all cars 0.7), 21,231 MOT tests5 years: 1.1 per 100 (all cars 1.0), 29,095 MOT tests56 years: 1.5 per 100 (all cars 1.3), 40,183 MOT tests7 years: 2.4 per 100 (all cars 1.7), 47,544 MOT tests78 years: 2.7 per 100 (all cars 2.1), 51,185 MOT tests9 years: 2.9 per 100 (all cars 2.4), 52,033 MOT tests910 years: 2.8 per 100 (all cars 2.8), 48,046 MOT tests11 years: 2.8 per 100 (all cars 3.2), 44,019 MOT tests1112 years: 4.9 per 100 (all cars 3.7), 45,737 MOT tests13 years: 7.7 per 100 (all cars 4.3), 48,525 MOT tests1314 years: 9.6 per 100 (all cars 5.1), 47,212 MOT tests15 years: 10.7 per 100 (all cars 5.7), 33,384 MOT tests1516 years: 11.5 per 100 (all cars 6.2), 18,007 MOT tests17 years: 10.9 per 100 (all cars 6.5), 6,696 MOT tests17
Fails per 100 MOT tests by age, all first-use years pooled. Peugeot 308 All class 4 vehicles the same age
AgeMOT testsFails per 100All class 4 vehicles the same age
316,6240.50.5
421,2310.80.7
529,0951.11.0
640,1831.51.3
747,5442.41.7
851,1852.72.1
952,0332.92.4
1048,0462.82.8
1144,0192.83.2
1245,7374.93.7
1348,5257.74.3
1447,2129.65.1
1533,38410.75.7
1618,00711.56.2
176,69610.96.5

All first-use years of the Peugeot 308 pooled at each age, against all class 4 vehicles at that age over all 2022–2025 test years.

What fails in the exhaust, emissions and leaks at 9 years

Fails

Advisories (not fails)

Diagnose engine warning light cost

Repair figures are estimates, not quotes: how we estimate repair costs.

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  • Model risks for this year and fuel
  • What similar cars did at their next MOT
  • Repairs ahead
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See a sample report

By engine and fuel

  • 1.6 diesel: 2.1 per 100 at 9 years, about average for diesel class 4 vehicles the same age (all test years; 36,010 MOT tests)
  • 1.2 petrol: 6.1 per 100 at 9 years, fails 2.3–2.7× as often as petrol class 4 vehicles the same age (all test years; 8,254 MOT tests)
  • 1.6 petrol: 4.6 per 100 at 9 years, about average for petrol class 4 vehicles the same age (all test years; 2,444 MOT tests)

How to check on a test drive

Start the car from cold and look for smoke at the exhaust, listen for blowing joints, and look under the engine and gearbox for fresh oil or fluid drips.

The most common advisory here in MOT records: Engine oil leaks: leak, but not excessive.

Check one Peugeot 308, not the average

The figures here describe Peugeot 308 cars as a group. These free tools answer for one car. Each line says what the tool reads.

Other Peugeot 308 problems

Exhaust, emissions and leaks on rival models

Questions people ask

Does the Peugeot 308 have more exhaust, emissions and leaks problems than other cars?

2.9 in 100 MOT tests at 9 years, against 2.4 for all class 4 vehicles the same age: about average by our test (all test years; 52,033 MOT tests).

How common are Peugeot 308 exhaust, emissions and leaks problems?

2.9 in 100 MOT tests at 9 years failed on exhaust, emissions and leaks, against 2.4 for all class 4 vehicles the same age (all test years; 52,033 MOT tests).

What is the most common Peugeot 308 exhaust, emissions and leaks fail?

0.7 in 100 MOT tests at 9 years: Malfunction indicator lamp: inoperative or indicates a malfunction (381 MOT tests with it).

At what age do Peugeot 308 exhaust, emissions and leaks fails start?

12 years: from then on the rate stays clear of 1.2 times all class 4 vehicles the same age at every age seen, 199,561 MOT tests.

Sources

  1. Driver and Vehicle Standards Agency, Anonymised MOT tests and results, 2022 to 2025. DVSA MOT data, Open Government Licence v3.0, 549,521 MOT tests. Accessed 7 Oct 2026.
  2. Office for National Statistics, Consumer price inflation, local price quotes (car repair items). ONS price quotes, series 610236. Accessed 7 Oct 2026.

Parts: against all class 4 vehicles at the same age, all 2022–2025 test years pooled, not adjusted for mileage. Breakdowns and non-MOT faults are not in this data. How we compare