MOT failure rates

Porsche Cayman MOT failure rates: what to expect

What fails on a Porsche Cayman at MOT, how often, and what each fix typically costs.

Updated 4th September 2026 DVSA data: Across 14,235 recorded MOT tests, 9.4% failed.

Porsche Cayman
Image via Wikipedia, CC-licensed.

The Porsche Cayman is a popular sports car, but like any vehicle, it can encounter issues that may cause it to fail its MOT. Common failures include problems with the brakes, suspension, and emissions systems. Understanding these issues and their typical repair costs can help owners maintain their vehicles effectively.

Brake System Failures

Braking issues are among the most common reasons for MOT failures in the Porsche Cayman. Problems can arise from worn brake pads, damaged discs, or issues with the brake lines.

The Cayman’s braking system is crucial for performance, and failure to address issues can lead to reduced safety. Regular checks and timely replacements can prevent more severe damage and ensure optimal performance. Additionally, keep an eye on brake fluid levels and condition, as this can also affect braking efficiency.

Suspension Problems

Suspension components, including shock absorbers and bushings, are vital for handling and ride comfort. MOT failures often stem from worn or leaking shock absorbers, which can lead to a bumpy ride and decreased handling performance.

The Cayman’s suspension is designed for sporty handling, making it essential to keep it in good condition. Regular inspections can help identify wear before it leads to an MOT failure. Consider having the alignment checked periodically, especially if you notice uneven tyre wear or handling issues.

Emissions System Issues

Emissions failures are increasingly common in modern vehicles, including the Porsche Cayman. Problems can arise from faulty catalytic converters, oxygen sensors, or exhaust leaks.

With stricter emissions regulations in place, ensuring your Cayman’s emissions system is functioning correctly is crucial. Regular servicing can help identify issues early, and using high-quality fuel can also contribute to better emissions performance. If you notice warning lights related to emissions, address them promptly to avoid MOT complications.

Tyre Condition and Tread Depth

Tyres are a critical safety component and are frequently a cause of MOT failures. The legal minimum tread depth in the UK is 1.6mm, but it is advisable to replace tyres when they reach 3mm for better performance and safety.

The Cayman is designed for performance, and using the right tyres can enhance handling and grip. Regularly checking tyre pressure and tread depth can help maintain safety and performance. Additionally, consider rotating your tyres regularly to ensure even wear, which can extend their lifespan.

Electrical System Failures

Electrical issues can also lead to MOT failures in the Porsche Cayman. Common problems include malfunctioning lights, faulty sensors, or issues with the battery and charging system.

The Cayman’s advanced electronics are integral to its performance and safety features. Regular checks of lights and electrical systems can help prevent MOT failures. If you experience intermittent electrical issues, it is wise to have them diagnosed as soon as possible to avoid more significant problems down the line.

Bodywork and Structural Integrity

While less common, issues with bodywork and structural integrity can also result in MOT failures. Rust, corrosion, or damage to the chassis can be problematic, especially in older models.

Maintaining the bodywork of your Cayman is essential not only for aesthetics but also for safety. Regularly washing and waxing the car can help protect against rust and corrosion. Inspecting the undercarriage and wheel arches for signs of rust can help catch issues early, ensuring your vehicle remains roadworthy.

Summary of Common Failures and Repair Costs

Understanding the common MOT failures for the Porsche Cayman can help owners take proactive measures to maintain their vehicles. Brake system issues, suspension problems, emissions failures, tyre condition, electrical system faults, and bodywork integrity are all areas to monitor. Repair costs can vary widely, so budgeting for maintenance and repairs is essential for keeping your Cayman in top condition.

By staying informed about these potential issues and addressing them promptly, Porsche Cayman owners can enjoy their vehicles while ensuring they pass their MOTs with ease. Regular maintenance and inspections can save money in the long run and enhance the driving experience.

Porsche Cayman recall record

8 recalls have been issued for the Porsche Cayman, between 2006 and 2024.

  1. ARA7 Recall campaign - Replace shift cable

    R/2024/243

    Issued 5 June 2024

    On affected vehicles the transmission shift cable may have had the safety clip on the shift cable incorrectly fitted or the cable sheath on the shift cable may be damaged resulting in the risk of a roll away incident after the vehicle is placed in park (P) if the parking brake is not applied.

    Remedy:Replace shift cable

    Affects cars built Jun 2023 to Mar 2024

  2. On affected vehicles the rear spoiler setting may not meet specifications due to incorrect coding during production making it too high. The high-mounted brake light may become less visible while driving and the aerodynamics of the vehicle may change.

    R/2024/001

    Issued 20 December 2023

    On affected vehicles the rear spoiler setting may not meet specifications due to incorrect coding during production making it too high.� The high-mounted brake light may become less visible while driving and the aerodynamics of the vehicle may change.

    Remedy:Re-code the rear vehicle electronics control unit on affected vehicles.�

    Affects cars built Jun 2023 to Oct 2023

  3. REAR AXLE CARRIER SIDE PARTS MAY NOT MEET REQUIRED SPECIFICATIONS

    R/2021/314

    Issued 15 September 2021

    The carrier side parts installed on the rear axle during a certain period may not meet the required specifications.

    Remedy:The left and right carrier side parts of the affected vehicles must be replaced.

    Affects cars built Jan 2014 to Jul 2014

  4. AIR BAG CONTROL UNIT MAY HAVE BEEN INSTALLED WITH A FAULTY CAPACITOR

    R/2019/250

    Issued 23 August 2019

    Possible fault within the air bag control unit.

    Remedy:Software upgrade to the control unit and replacement if faulty.

    Affects cars built Jun 2015 to Jun 2016

4 older recalls not shown.

A recall applies to a build range, not to every car of this model. Check a registration to see whether one specific vehicle has an outstanding recall.

Porsche Cayman MOT record

From 14,235 recorded MOT tests, 9.4% failed.

MOT pass and failure rates by year of first registration
RegisteredTestsFailedMedian mileage
20224634.5%11,559 mi
20214313.3%16,366 mi
20204224.7%19,614 mi
20199785.3%26,400 mi
20181,1665.7%31,044 mi
20178685.3%34,446 mi
20169785.2%30,143 mi
20151,0805.7%37,012 mi

Most common reasons for failure

  1. Tyre tread depth not in accordance with the requirements27.5%
  2. Brake pipe damaged or excessively corroded26.1%
  3. A tyre seriously damaged21.0%
  4. Brake disc or drum excessively weakened, insecure or fractured14.9%
  5. A suspension pin, bush or joint excessively worn10.5%

Figures cover every Porsche Cayman tested in the DVSA dataset, not this specific car. Check a registration for the actual history of one vehicle.

Frequently asked questions

What is the MOT requirement for a Porsche Cayman?

In the UK, a Porsche Cayman must have an MOT test every year once it is three years old. This test checks that the vehicle meets road safety and environmental standards.

How can I check the MOT history of a Porsche Cayman?

You can check the MOT history of a Porsche Cayman by visiting the official UK government website. You will need the vehicle's registration number to access its records.

What common issues might a Porsche Cayman face during its MOT?

Common issues that may arise during an MOT for a Porsche Cayman include worn brake pads, faulty lights, and issues with emissions. Regular maintenance can help prevent these problems.

What should I do if my Porsche Cayman fails its MOT?

If your Porsche Cayman fails its MOT, you will receive a list of issues that need to be addressed. You can have the necessary repairs done and then retest the vehicle within a specified period.

Can I drive my Porsche Cayman if it has an expired MOT?

No, you cannot legally drive your Porsche Cayman if it has an expired MOT, unless you are taking it to a pre-booked MOT appointment. Driving without a valid MOT can result in fines.

Is it possible to get a same-day MOT for my Porsche Cayman?

Many garages offer same-day MOT services, but it is best to book in advance to ensure availability. Check with local garages for their specific policies.

Sources