Porsche 928 S: MOT pass rate and reliability data

The Porsche 928 S passes its MOT first time more often than the average UK car, by 4.8 percentage points. These figures come from the DVSA's full year of anonymised MOT results, covering 513 individual Porsche 928 S tests. Nothing here is an estimate or a survey.

The numbers

What this means if you are buying one

A 81.5% first-time pass rate means roughly 19 in every 100 Porsche 928 S presented for MOT fail on the first attempt. That is better than average, so a well-kept example is a reasonably safe used buy. The average Porsche 928 S tested had covered 110,676 miles and was built around 1988.

What this means at salvage auction

Pass rate is a proxy for what a car costs to keep on the road. On a Porsche 928 S bought as a repairable salvage, the mechanical side is less likely to spring surprises, so your repair estimate should hold up reasonably well.

Before you bid: run the lot through the analyzer, check the car's own record, check the mileage, decode the VIN, and if it carries a marker use the write-off value calculator. Or compare it against another model.

Looking at a specific Porsche 928 S rather than the model in general? The free check covers its MOT and mileage history, and the full HPI report confirms the insurance write-off category, outstanding finance and whether it is recorded stolen, from licensed data for 5 credits. Already own one that has been damaged? Work out whether fixing it beats selling it with the repair or scrap calculator, and see what damaged Porsche 928 S actually sold for at UK salvage auction.

Most common MOT failures on a Porsche 928 S

1. Fuel system leaking, or missing or ineffective filler cap, 1.2% of tests (12.37x the national rate for this defect)
2. An obligatory rear fog lamp missing, or a front or rear fog lamp inoperative or in the case of a multiple light source more than 1/2 not functioning, 3.6% of tests (10.62x the national rate for this defect)
3. Emissions levels exceed default limits, 2.3% of tests (8.01x the national rate for this defect)
4. Steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, 1.9% of tests (3.44x the national rate for this defect)
5. Windscreen washers not working or not providing sufficient fluid to clear the windscreen, 3.4% of tests (2.79x the national rate for this defect)
6. The aim of a headlamp is not within limits laid down in the requirements, 4% of tests (2.24x the national rate for this defect)
7. The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, 1.5% of tests (1.76x the national rate for this defect)
8. A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc, 1.6% of tests (1.44x the national rate for this defect)
9. A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning, 1.6% of tests
10. A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps, 1% of tests (1.47x the national rate for this defect)

From 1,367 DVSA-tracked Porsche 928 S tests, 2024. DVSA testers marked 1.36% of these flagged Porsche 928 S defects as "dangerous", meaning the tester judged the car unsafe to drive away, against 4.97% nationally.

Other Porsche models

• Porsche 911 - 89%
• Porsche Boxster - 84.2%
• Porsche Macan - 92.1%
• Porsche Cayenne - 86.4%
• Porsche Cayman - 89.9%
• Porsche Panamera - 87.8%
• Porsche Taycan 4s 93kwh - 90.8%
• Porsche 944 - 77.4%

Models with a similar pass rate

• Toyota Iq - 81.5%
• Vauxhall Vivaro 2700 Sportive S/S - 81.5%
• Citroen C4 Sense + Puretech S/S - 81.5%
• MG Zs - 81.4%
• Tesla Model 3 Performance Awd - 81.4%
• Jaguar Xjs - 81.4%

If this car is a salvage or write-off

• What does Cat N mean? Category N explained
• What does Cat S mean? Category S explained
• Cat S vs Cat N: the real differences

Embed this data

Run a site about the Porsche 928 S? Embed the real DVSA pass-rate badge free, linked back to this page.

<a href="https://www.salvageprophet.co.uk/mot/porsche-928-s"><img src="https://www.salvageprophet.co.uk/badge/porsche-928-s.svg" width="340" height="92" alt="Porsche 928 S MOT Pass Rate: 81.5% - Salvage Prophet"></a>

All 2,005 models ranked by MOT pass rate