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Porsche 911 Common Problems, Faults & Repair Costs (2026)

Based on official DVSA MOT test data. View the most common MOT failure categories, pass rates, and estimated repair costs for the Porsche 911 (1998–present).

MOT Pass Rate

86.8%4.8% above national avg (82%)

Reliability rating: Excellent — based on approx. 12,000 tests

Dangerous Defects

1.10%

Moderate risk

Retest Rate

9.5%

of failed tests need a retest

Top MOT Failure Categories

1

Lamps, reflectors and electrical equipment

Est. repair: £40–£200

12.5%
2

Suspension

Est. repair: £120–£450

11.0%
3

Brakes

Est. repair: £100–£350

9.5%
4

Tyres

Est. repair: £50–£120 per tyre

9.0%
5

Exhaust, fuel and emissions

Est. repair: £40–£200

6.2%

Where Faults Occur

30.0%

Front

26.0%

Rear

20.0%

Offside

Mileage Benchmarks

At 3 years

12,000 mi

At 5 years

20,000 mi

At 10 years

38,000 mi

Significantly higher or lower mileage than these benchmarks may indicate unusual usage patterns. Check the full MOT history for mileage consistency.

Is a Porsche 911 a Good Buy?

The Porsche 911 demonstrates above-average reliability based on MOT test data, with a 86.8% pass rate. This places it 4.8% above the national average, suggesting lower ongoing maintenance costs compared to many competitors.

While no car is without faults, lamps, reflectors and electrical equipment issues are the most common concern, affecting approximately 12.5% of failed tests. These tend to be relatively affordable to fix at £30–£150.

Porsche 911 MOT Check & History

View detailed MOT pass rates by year, mileage benchmarks, and full test history data for the Porsche 911.

View Porsche 911 MOT Data

Check a Specific Porsche 911

Enter a registration number to view the full MOT history for any Porsche 911.

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Other Porsche Models

Porsche Cayenne

80.5%

Lamps, reflectors and electrical equipment →

Porsche Macan

85.2%

Lamps, reflectors and electrical equipment →

Porsche Boxster

84.5%

Lamps, reflectors and electrical equipment →

Porsche Panamera

82.8%

Lamps, reflectors and electrical equipment →

Porsche Taycan

91.2%

Lamps, reflectors and electrical equipment →

Porsche Cayman

85.8%

Lamps, reflectors and electrical equipment →

View all Porsche models

Frequently Asked Questions

What are the most common MOT faults on a Porsche 911?
The top MOT failure on the Porsche 911 is Lamps, reflectors and electrical equipment, accounting for approximately 12.5% of all failures. Other common issues include suspension and brakes.
What is the Porsche 911 MOT pass rate?
The Porsche 911 has an estimated MOT pass rate of 86.8%, which is 4.8% above the national average of 82%. This rates the Porsche 911 as "Excellent" for MOT reliability.
Is the Porsche 911 reliable?
Based on DVSA MOT data, the Porsche 911 has a excellent reliability record with a 86.8% pass rate. It has a dangerous defect rate of 1.10% and a retest rate of 9.5%.
How much does it cost to fix common Porsche 911 MOT failures?
Typical repair costs for Porsche 911 MOT failures range from £30–£200 for lamps, reflectors and electrical equipment issues to £120–£450 for suspension problems. Prices are estimates based on typical UK independent garage rates.
What mileage should a Porsche 911 have?
Based on MOT test data, the average Porsche 911 covers approximately 12,000 mi by 3 years, 20,000 mi by 5 years, and 38,000 mi by 10 years. Significantly higher or lower mileage may warrant closer inspection.
Should I buy a used Porsche 911?
The Porsche 911 is generally a solid choice based on MOT data. Check the full MOT history of any specific vehicle before purchasing, paying particular attention to lamps, reflectors and electrical equipment issues and mileage consistency.
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