At a Glance
The Porsche 928 has 11 identified common problems across 1 generation, with the 928 (1977-1995) being the most affected generation and brakes the most common problem category. Based on 23K MOT tests from DVSA data.
Problems are patterns in the DVSA data that occur significantly more often on a specific model than the UK average — confirmed at 99% statistical confidence. Read our DVSA MOT data methodology →
Below: generation-by-generation comparison of Porsche 928 common problems, MOT failure types, and pass-rate data drawn from DVSA records. Click any generation to see fuel- and engine-specific fault patterns, mileage-banded repair guidance, and the most common MOT failures testers record.
MOT Tests & Failures by Generation
Porsche 928 generations by MOT tests, failures, and identified problems from DVSA data
Hover over each bar for a full breakdown. Tap any bar to view that generation's problems.
Showing total MOT tests, failures, and known problems per make. Hover over each bar for a full breakdown.
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Browse Porsche 928 Generations
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Most Common Porsche 928 MOT Failures
Every reason Porsche 928 vehicles fail their MOT, ranked by frequency. Select an individual year to see only that year’s failures, or stay on ‘All time’ for the combined picture across our 20 years of DVSA data. Scroll inside the table for the full list.
| # | Failure | % of failures |
|---|---|---|
| 1 | Windscreen washer not working | 9.90% |
| 2 | Brake performance below minimum | 6.77% |
| 3 | Wiper blades deteriorated | 6.42% |
| 4 | Number plate lamp not working | 6.30% |
| 5 | Headlamp aim defect | 5.29% |
| 6 | Tyre tread depth below limit | 5.18% |
| 7 | Tyre condition | 3.47% |
| 8 | Brake hydraulic component worn | 3.05% |
| 9 | Stop lamp not working | 2.95% |
| 10 | Suspension joint or bush worn | 2.61% |
| 11 | Catalytic converter efficiency low | 2.49% |
| 12 | Rear lamp not working | 2.42% |
| 13 | Front lamp not working | 2.41% |
| 14 | Horn not working | 2.29% |
| 15 | Driveshaft fault | 2.00% |
| 16 | Track rod end worn | 1.86% |
| 17 | Exhaust system fault | 1.68% |
| 18 | Indicator fault | 1.64% |
| 19 | Steering rack fault | 1.42% |
| 20 | Coil spring broken or corroded | 1.37% |
| 21 | Brake disc or drum worn | 1.35% |
| 22 | Position lamp not working | 1.35% |
| 23 | Fog lamp not working | 1.31% |
| 24 | Suspension mounting corroded | 1.28% |
| 25 | Parking brake condition | 1.26% |
| 26 | Front suspension fault | 1.19% |
| 27 | Headlamp fault | 1.13% |
| 28 | Seat belt condition | 1.13% |
| 29 | Spark ignition emissions above threshold | 1.04% |
| 30 | ABS fault | 0.93% |
| 31 | Rear fog lamp not working | 0.87% |
| 32 | Brake pads or linings worn | 0.83% |
| 33 | Flexible brake hose damaged | 0.73% |
| 34 | Parking brake performance below minimum | 0.73% |
| 35 | Shock absorber worn or leaking | 0.70% |
| 36 | Steering free play excessive | 0.64% |
| 37 | Power steering pipe or hose leaking | 0.60% |
| 38 | Mirror damaged or missing | 0.53% |
| 39 | Front suspension joint worn | 0.51% |
| 40 | Electrical switch fault | 0.49% |
| 41 | Windscreen damage affecting view | 0.49% |
| 42 | Steering arm worn | 0.48% |
| 43 | Body corrosion or damage | 0.43% |
| 44 | Ball joint dust cover split | 0.41% |
| 45 | Exhaust emissions above threshold (non-catalyst) | 0.37% |
| 46 | Fuel tank corroded or leaking | 0.37% |
| 47 | Brake pedal movement restricted | 0.32% |
| 48 | Fuel pipe corroded or damaged | 0.31% |
| 49 | Chassis condition | 0.30% |
| 50 | Headlamp levelling device fault | 0.30% |
| 51 | Drag link end worn | 0.27% |
| 52 | Suspension linkage fault | 0.26% |
| 53 | Steering operation fault | 0.25% |
| 54 | Dashboard warning lamp fault | 0.23% |
| 55 | Electrical wiring fault | 0.23% |
| 56 | Steering column fault | 0.22% |
| 57 | Wheel bearing worn | 0.22% |
| 58 | Rear fog lamp warning light fault | 0.18% |
| 59 | Airbag warning light on | 0.17% |
| 60 | Brake caliper fault | 0.16% |
| 61 | Vehicle structure corrosion | 0.16% |
| 62 | Fuel cap damaged or missing | 0.16% |
| 63 | Brake pedal fault | 0.14% |
| 64 | Steering wheel damaged or insecure | 0.14% |
| 65 | Power steering ram fault | 0.13% |
| 66 | Subframe mounting corroded | 0.13% |
| 67 | Fuel hose damaged or leaking | 0.12% |
| 68 | Passenger seat fault | 0.12% |
| 69 | Rigid brake pipe corroded or damaged | 0.12% |
| 70 | Speedometer fault | 0.12% |
| 71 | Tyre size or type not matched | 0.12% |
| 72 | Tyre valve stem damaged | 0.12% |
| 73 | Battery loose or leaking | 0.11% |
| 74 | Engine oil leak | 0.11% |
| 75 | Brake lever fault | 0.11% |
| 76 | Driver seat fault | 0.11% |
| 77 | Handbrake cable fault | 0.11% |
| 78 | Bonnet catch or hinge fault | 0.10% |
| 79 | Brake fluid leak | 0.10% |
| 80 | Boot lid damaged or insecure | 0.09% |
| 81 | Front passenger door fault | 0.09% |
| 82 | Handbrake lever fault | 0.09% |
| 83 | Rear suspension fault | 0.09% |
| 84 | Brake back plate corroded or damaged | 0.08% |
| 85 | Brake fluid level low or contaminated | 0.08% |
| 86 | Steering lock fault | 0.08% |
| 87 | Brake fluid warning light on | 0.06% |
| 88 | CV joint worn | 0.06% |
| 89 | Tailgate damaged or insecure | 0.06% |
| 90 | Handbrake mechanism or mounting fault | 0.05% |
| 91 | Compression ignition emissions above threshold | 0.05% |
| 92 | Power steering pump fault | 0.05% |
| 93 | Body security fault | 0.04% |
| 94 | Brake cable, rod, lever or linkage fault | 0.04% |
| 95 | Driver door fault | 0.04% |
| 96 | Anti-roll bar worn or corroded | 0.03% |
| 97 | Dip switch fault | 0.03% |
| 98 | Tie bar or rod worn or corroded | 0.03% |
| 99 | Steering coupling worn | 0.03% |
| 100 | MacPherson strut worn | 0.03% |
| 101 | Main beam warning light fault | 0.03% |
| 102 | Propshaft fault | 0.03% |
| 103 | Spring mounting corroded | 0.03% |
| 104 | Steering drive system fault | 0.03% |
| 105 | Additional braking device fault | 0.02% |
| 106 | Exhaust leak | 0.02% |
| 107 | Hydraulic fluid leak | 0.02% |
| 108 | Suspension retaining or locking device fault | 0.02% |
| 109 | Undertray damaged or missing | 0.02% |
| 110 | Bonded suspension condition | 0.02% |
| 111 | Brake air or vacuum system fault | 0.01% |
| 112 | Driver airbag fault | 0.01% |
| 113 | Electronic stability control fault | 0.01% |
| 114 | Full power hydraulic brake fault | 0.01% |
| 115 | Rear reflector damaged or missing | 0.01% |
| 116 | Reversing lamp not working | 0.01% |
| 117 | Subframe corrosion or damage | 0.01% |
| 118 | Suspension arm worn or corroded | 0.01% |
| 119 | Suspension rod worn or corroded | 0.01% |
| 120 | Transmission oil leak | 0.01% |
| 121 | Tyre pressure monitoring system fault | 0.01% |
| 122 | Access panel damaged or insecure | <0.01% |
| 123 | Brake clevis joint worn | <0.01% |
| 124 | Brake fluid reservoir fault | <0.01% |
| 125 | Brake master cylinder or servo mounting fault | <0.01% |
| 126 | Brake stationary pin worn | <0.01% |
| 127 | Hand-operated brake valve condition | <0.01% |
| 128 | Handbrake fails on gradient | <0.01% |
| 129 | Semaphore indicator fault | <0.01% |
| 130 | Steering shaft fault | <0.01% |
| 131 | Trailing arm worn or corroded | <0.01% |
Showing all 131 reasons — scroll inside the table for the full list.
Porsche 928 MOT Failures by Category
Total MOT failure occurrences for the Porsche 928, grouped by category. Same data as the failures table above — just sliced by category instead of fault title. Hover a slice for the top failures in each category.
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Frequently Asked Questions
What are the most common Porsche 928 problems?
Based on analysis of 23K Porsche 928 MOT tests from DVSA data, we have 11 identified common problems across 1 generation. The most frequently flagged issue is "Fog lamp not working". Brakes is the most common problem category.
Which Porsche 928 generation has the most problems?
The Porsche 928 928 (1977-1995) (1977–1995) has the highest number of identified common problems (13). Click the generation card above for the full breakdown.
How is this data calculated?
We analyse anonymised DVSA MOT test records under the Open Government Licence. An issue is classified as a "Common Problem" when it occurs significantly more often on a specific model than the UK average, confirmed at 99% statistical confidence. Read the full methodology page for details.
Can I report a problem with my Porsche 928?
Yes — use the "Tell Us About Your Problem" form on this page. Your report helps other Porsche 928 owners spot problems early. All submissions are reviewed before being added to the public database.
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