P Porsche 911 MOT Pass Rate & Official DVSA Failure Statistics

Porsche 911 MOT History and Failure Rates vs UK National Average

The Porsche 911 passed on its first attempt in 90.4%, and its overall record sits +10.0 percentage points above the national average for all cars. These figures come from every recorded DVSA MOT test for the Porsche 911 in the 2023–2025 data: 121,590 tests across 23 model years (2000–2022). A test still carries exactly one pass or fail verdict.

Figures are computed from every recorded DVSA test for this model in the 2023–2025 data.

Most Common Porsche 911 MOT Problems by Failure Category

Every MOT failure a tester records belongs to one inspection section of the DVSA manual. For the Porsche 911, the Lamps, reflectors and electrical equipment section leads the record — the breakdown below shows where the recorded failures cluster, then the exact strings behind the three biggest sections.

Shares are over the Porsche 911's recorded defect strings, merged across its year pages.

Top Recorded Porsche 911 DVSA MOT Test Statistics & Defect Descriptions

The descriptions below are the exact DVSA failure strings testers recorded most often for the Porsche 911, each with how many of the model's 121,590 tests it was noted on.

• "Windscreen damaged but not adversely affecting driver's view" (Minor) — noted on about 2,304 Porsche 911 tests, 1.9% of the model's MOT record.
• "Catalyst emissions Lambda reading after 2nd fast idle outside specified limits" (Major) — noted on about 1,313 Porsche 911 tests, 1.1% of the model's MOT record.
• "Registration plate lamp(s) inoperative in the case of multiple lamps or light sources" (Minor) — noted on about 1,175 Porsche 911 tests, 1.0% of the model's MOT record.
• "Joints constant velocity boot split or insecure, no longer prevents the ingress of dirt" (Major) — noted on about 1,067 Porsche 911 tests, 0.9% of the model's MOT record.
• "Joints constant velocity boot severely deteriorated" (Minor) — noted on about 940 Porsche 911 tests, 0.8% of the model's MOT record.
• "Position lamp not working" (Major) — noted on about 705 Porsche 911 tests, 0.6% of the model's MOT record.

Best and Worst Porsche 911 Model Years by Pass Rate

The strongest Porsche 911 model year on record is 2022 (96.6% across 387 tests), and the weakest is 2000 (85.5%). The gap between them is 11.1 points. Years with fewer than 50 recorded tests are excluded, so these are the years with enough MOT history to mean something.

Newest model year first. Only years with at least 50 recorded tests are listed.

Pre-MOT Inspection Checklist for Porsche 911 Owners

These checks follow this Porsche 911's own most-recorded failure strings, starting with what a tester is most likely to flag on a Porsche 911.

• the windscreen — “windscreen damaged”

  Check the driver’s side of the screen within the swept area for chips and cracks; anything larger than 10mm in the driver’s central view is a fail. Most chips can be resin-repaired for far less than a new screen.

• the exhaust and emissions — “catalyst emissions Lambda reading after 2nd fast idle outside specified limits”

  Listen for a blow at idle and have someone rev it gently. Then look at the tailpipe smoke: blue is oil, white when warm is coolant, black is over-fuelling. Any of those and the emissions test is the least of it.

• the lights — “registration plate lamp(s) inoperative in the case of multiple lamps or light sources”

  Switch everything on and walk round the car: both headlamps on dip and main, every indicator, both brake lights, reverse, fog and the two number-plate lamps. A bulb is a few pounds and a five-minute job.

Derived from the DVSA failure strings testers recorded for the Porsche 911. A check that finds nothing means the item is likely fine, not that the test is guaranteed.

Where the Porsche 911 is most common

Across every 911 model year on record (2000–2022): 63,352 Porsche 911 cars tested in a recordable postcode area, across 121,517 tests. Guildford (GU) has the most, with 2,077 cars tested there. Cars are counted by the postcode area of the MOT station, so this is where they were tested, not necessarily where their owners live.

The twenty areas with the most Porsche 911 cars in the record, sorted by car count — sort the columns for a different question. Cars tested at a station whose postcode area could not be resolved are counted in the model's total but in no area, so the shares add up to slightly under 100% even across every area, and an area's cars are a subset of the model's. Pass rate is blank below 30 tests in an area, where a percentage is noise rather than a finding. How this model's pass rate varies by postcode →

Frequently Asked Questions: Porsche 911 MOT & Reliability