19.3%fail rate

Porsche Convertible common MOT failures and failure rate

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

Based on 145 MOT tests in DVSA data.

About 19.3% of MOT tests recorded on the Porsche Convertible in DVSA data end in a failure. The same handful of items account for most of them.

Its most common failure is lamps & electrical, which makes up 71.4% of the Porsche Convertible's failures, followed by lamps & electrical, other, visibility/wipers, brakes. 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

Lamps & electrical71.4% 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.

Other32.1% of failures

This covers a range of smaller items, from a non-working horn to a warning light left on.

Visibility/wipers25.0% 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.

Brakes21.4% 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.

Tyres14.3% 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.

Exhaust & emissions10.7% 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.

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 lamps & electrical failure: Porsche Convertible headlight and indicator bulbsSearch Amazon for Porsche Convertible headlight and indicator bulbsaffiliate search Find Porsche Convertible headlight and indicator bulbs on eBayaffiliate

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

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

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

For the exhaust & emissions failure: Porsche Convertible exhaustSearch Amazon for Porsche Convertible exhaustaffiliate search Find Porsche Convertible exhaust 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