Porsche 928 Reliability, MOT Pass Rate & Common Faults
Free Porsche 928 car check
Is the Porsche 928 reliable? We analysed 7,969 real MOT tests across 782 vehicles to find out.
Got a specific Porsche 928? Enter the reg for a free check:
The Porsche 928 is above average for reliability based on real UK MOT data. Common problems include exhaust emissions lambda reading after 2nd fast idle outside specified limits, windscreen washer provides insufficient washer liquid and headlamp aim too low. Here's everything you need to know before buying a used Porsche 928.
Porsche 928 Number Plates
Number plates registered to a Porsche 928. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Porsche 928 MOT Pass Rate by Year
How likely is a Porsche 928 to pass its MOT? Here's the pass rate for each registration year, newest first.
Porsche 928 Problems — What Goes Wrong?
The most common reasons a Porsche 928 fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Porsche 928 Mileage — What's Normal?
How many miles does a typical Porsche 928 owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Porsche 928 MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Porsche 928 year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1995 | 1,045 | 77.7% | 53,932 | 73,874 | 101,932 |
| 1994 | 945 | 77.4% | 57,132 | 83,718 | 105,255 |
| 1993 | 900 | 75.3% | 63,443 | 91,581 | 114,013 |
| 1992 | 554 | 77.6% | 86,118 | 112,099 | 134,683 |
| 1991 | 555 | 80.4% | 87,857 | 104,798 | 143,482 |
| 1990 | 882 | 82.4% | 71,175 | 100,292 | 122,240 |
| 1989 | 895 | 79.6% | 77,775 | 108,053 | 139,269 |
| 1988 | 83 | 84.3% | 74,140 | 81,403 | 94,608 |
| 1987 | 88 | 83.0% | 49,244 | 77,896 | 108,460 |
| 1982 | 334 | 68.9% | 77,634 | 104,678 | 133,167 |
| 1981 | 223 | 65.5% | 75,025 | 118,098 | 140,142 |
| 1980 | 377 | 70.0% | 67,940 | 102,851 | 126,072 |
| 1979 | 607 | 74.5% | 75,924 | 101,672 | 113,987 |
| 1978 | 263 | 76.8% | 82,388 | 100,963 | 121,674 |
How Long Does a Porsche 928 Last?
Based on 782 Porsche 928 vehicles on UK roads.
Porsche 928 Mileage Distribution
Total mileage recorded across all Porsche 928 MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Porsche 928
Based on MOT pass rates across all registration years with sufficient test data.
84.3% MOT pass rate from 83 tests
65.5% MOT pass rate from 223 tests
The best year to buy a used Porsche 928 is 1988, which has the highest MOT pass rate at 84.3% across 83 tests. The 1981 model year has the lowest pass rate at 65.5% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Porsche 928 Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Porsche 928 THIS CAR | 77.0% | 7,969 | 96,096 mi | 48 yrs |
| Porsche 911 | 85.2% | 977,057 | 55,056 mi | 47 yrs |
| Porsche Boxster | 82.8% | 726,695 | 55,739 mi | 29 yrs |
| Porsche Cayenne | 84.5% | 388,697 | 65,616 mi | 23 yrs |
| Yamaha Xjr 1300 | 90.4% | 5,805 | 14,436 mi | 28 yrs |
Compared to the Porsche 911 (85.2% pass rate) and the Porsche Boxster (82.8% pass rate), the Porsche 928 trails behind on MOT reliability.
Found a Porsche 928 you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Porsche 928Should you buy a used Porsche 928?
The Porsche 928 has an overall MOT pass rate of 77.0% across 7,969 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
The most common problems on the Porsche 928 are exhaust emissions lambda reading after 2nd fast idle outside specified limits (243 recorded failures), windscreen washer provides insufficient washer liquid (239), and headlamp aim too low (162). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
A typical Porsche 928 owner drives around 680 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Porsche 928 models stay on UK roads for around 48 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.