5.2%fail rate

Porsche 911 Speedster common MOT failures and failure rate

What a Porsche 911 Speedster fails its MOT on, from real DVSA test data, and the part that resolves each item.

Based on 367 MOT tests in DVSA data.

About 5.2% of MOT tests recorded on the Porsche 911 Speedster in DVSA data end in a failure. The same handful of items account for most of them.

Its most common failure is brakes, which makes up 42.1% of the Porsche 911 Speedster's failures, followed by brakes, lamps & electrical, seat belts, exhaust & emissions. Each item below links to the part that resolves it. Confirm the exact fitment against your registration or VIN before buying, and have safety-critical work done by a competent mechanic.

What it fails on, and why

Brakes42.1% of failures

Brake failures cover worn pads and discs, an imbalance between wheels, corroded or scored discs, or a binding caliper. Braking efficiency is measured on a rolling road, so a spongy or pulling brake shows up as a low reading.

Lamps & electrical26.3% of failures

Lighting is the single most common MOT failure and the cheapest to put right. A blown headlight, brake-light or number-plate bulb, a cracked lens, or a headlamp beam that points too high or low will all fail. Most are a two-minute bulb swap.

Seat belts15.8% of failures

Seat-belt failures are frays, cuts, corroded anchorages, or a belt that will not lock under a sharp pull or retract properly.

Exhaust & emissions15.8% of failures

Exhaust failures cover leaks, insecure mountings and emissions over the limit. A blowing exhaust, a failed lambda reading or a diesel that smokes beyond the limit will fail.

Tyres15.8% of failures

Tyres fail for tread below the 1.6mm legal limit across the central three-quarters, uneven or exposed-cord wear, or sidewall damage. The tester inspects all four; a single illegal tyre is a fail.

Visibility/wipers10.5% of failures

Visibility failures include torn or smearing wiper blades, a washer jet that does not reach the screen, and chips or cracks in the driver's swept area. Blades and washer fluid are quick, cheap fixes.

The parts that fix each

If your car has just failed, you have 10 working days to fix the items and get a free partial retest. These are the usual parts; confirm the exact fitment against your registration or VIN before buying.

For the brakes failure: Porsche 911 Speedster brake pads and discsSearch Amazon for Porsche 911 Speedster brake pads and discsaffiliate search Find Porsche 911 Speedster brake pads and discs on eBayaffiliate

For the lamps & electrical failure: Porsche 911 Speedster headlight and indicator bulbsSearch Amazon for Porsche 911 Speedster headlight and indicator bulbsaffiliate search Find Porsche 911 Speedster headlight and indicator bulbs on eBayaffiliate

For the seat belts failure: Porsche 911 Speedster seat beltsSearch Amazon for Porsche 911 Speedster seat beltsaffiliate search Find Porsche 911 Speedster seat belts on eBayaffiliate

For the exhaust & emissions failure: Porsche 911 Speedster exhaustSearch Amazon for Porsche 911 Speedster exhaustaffiliate search Find Porsche 911 Speedster exhaust on eBayaffiliate

For the tyres failure: Porsche 911 Speedster tyresSearch Amazon for Porsche 911 Speedster tyresaffiliate search Find Porsche 911 Speedster tyres on eBayaffiliate

For the visibility/wipers failure: Porsche 911 Speedster wiper bladesSearch Amazon for Porsche 911 Speedster wiper bladesaffiliate search Find Porsche 911 Speedster wiper blades on eBayaffiliate

Other models

Porsche 911 MOT failures14.7% failure rate Porsche Boxster MOT failures17.2% failure rate Porsche Cayenne MOT failures15.4% failure rate Ford Fiesta MOT failures27.1% failure rate

Sources: DVSA MOT History API: MOT test results and defect data · DVSA MOT testing data for Great Britain