What goes wrong, what it costs, and what to check before you buy a used Porsche 924.
The Porsche 924 occupies a niche position on the UK market.
We track 5 known issues across the Porsche 924 range, including 2 rated as safety-critical. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a Porsche 924? Enter the reg to see which of our 5 known issues apply to that exact car, plus full MOT history and mileage checks.
924 (1976–1988) — Engine options included the 2.0L Audi inline-four, 2.5L inline-four (924S). Our database flags 5 known issues on this generation, 2 of which are rated as safety-critical. The most significant concern is Wheel bearing premature failure (£150–£250 to address).
MOT data shows 924 variants fail wheel bearing tests at 662.0 times the national average, with failures occurring across all mileage bands from 20k miles upward. The combination of the car's age, original sealed bearing design, and the stress from wide tyres on later examples accelerates bearing wear. Front bearings typically fail first due to steering loads and the rear-weight bias of the transaxle layout.
Worn wheel bearings can collapse without warning, causing immediate loss of steering control and wheel detachment. The car should not be driven if bearing play is detected during hand checking. Replacement of a single bearing typically costs £200-£400 but multiple bearings commonly need attention on cars of this age.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
MOT data shows 924S variants fail structural integrity tests at 1652.1 times the national average between 40-80k miles for corrosion within prescribed areas around suspension mounting points. The rear-heavy weight distribution and transaxle layout places high stresses on the rear suspension mounting points, while the front MacPherson strut towers are vulnerable to corrosion from road salt. This is a critical safety defect that can cause catastrophic suspension failure.
Structural corrosion around suspension mounting points can lead to sudden suspension collapse, loss of vehicle control, and serious accident risk. Cars with significant structural corrosion may be beyond economical repair and should not be driven. Professional structural assessment is essential if any corrosion is suspected in these areas.
Inspect the wheel arches, sills, jacking points and door bottoms carefully. Press gently on sills to check for soft spots. Look underneath for corrosion on structural components. Check the MOT history for corrosion-related advisories or failures.
The 924's emission control system includes a complex arrangement of vacuum-operated components, thermal reactors, and catalytic converters that degrade with age. The Audi-derived engine's emission controls were designed for much shorter service lives than the cars now experience. Lambda sensors, vacuum hoses, and thermal reactor components commonly fail together.
Failed emissions components will cause immediate MOT failure and potentially damage the catalytic converter. Repair typically requires replacement of multiple vacuum components, sensors, and possibly the thermal reactor assembly. Total repair costs can exceed £1,500 for comprehensive emission system restoration.
Check for any engine warning lights on the dashboard. Ask about the car's MOT emissions history — repeated failures suggest underlying issues. A pre-purchase diagnostic scan is especially worthwhile to check for stored emissions fault codes.
The 924S uses a rear-mounted transaxle connected to the front engine by a long torque tube containing universal joints. MOT data shows 2.5L variants fail at 888.0 times the national average for universal joint wear between 60-80k miles. The driveshaft system experiences high loads and the universal joints within the torque tube are not easily serviceable. Failure progresses from vibration to complete loss of drive without warning.
Universal joint failure results in immediate loss of drive and potential damage to the torque tube assembly. The car cannot be driven and recovery is required. Repair requires removal of the entire torque tube assembly and typically costs £2,000-£4,000 including labour due to the complexity of the rear transaxle layout.
Listen for clunking or vibration from underneath when pulling away or changing direction. Check for play in the driveshafts by rocking the car in gear with the handbrake on. Worn CV boots are a telltale sign — look for grease splatter around the inner wheel arch.
MOT data shows multiple brake-related failures at rates significantly above the national average, including binding brakes at 1652.1 times average and corroded brake pipes at 1652.1 times average. The 924's brake system suffers from age-related corrosion of brake lines, seized caliper pistons, and degraded flexible hoses. The rear brake setup is particularly problematic due to its location near the transaxle where road salt accumulates.
Seized calipers cause uneven braking, increased stopping distances, and rapid tyre wear. Corroded brake pipes can fail suddenly resulting in partial or complete brake failure. Binding brakes generate excessive heat leading to brake fade and potential fire risk. Complete brake system restoration may be required on neglected examples.
Check brake disc condition for lipping or scoring. Test braking at moderate speed for pulling to one side or vibration through the steering wheel. Review MOT advisories for brake-related items.
For the full breakdown of all 5 tracked issues with repair costs, see the Porsche 924 common problems page.
Based on 4k real DVSA MOT tests, the Porsche 924 fails more often than average on several items. The biggest outlier is emissions failure at 756x the fleet average, followed by excessive wear or play in a universal joint or ... (597x).
When viewing a specific car, check its MOT history for recurring advisories in these categories. See the full Porsche 924 MOT failure breakdown for data at every mileage point.
Routine servicing (oil and filter change every 6k miles) typically costs £80–£120 at an independent garage.
The bigger-ticket items to budget for include timing belt (£350–£500).
See the full Porsche 924 service schedule for every interval and cost breakdown.
The Porsche 924 has some well-documented weak points, including 2 safety-critical issues that demand careful checking. The right example, properly maintained, can still be a sound purchase — but cutting corners on the pre-purchase inspection is not advisable.
Before committing, check the car's full MOT history, verify the service record is complete, and if possible arrange a specialist inspection. Enter any registration into our free report to see the complete picture.
Get Car Wise maintains a database of known mechanical issues for every popular car on UK roads, tracking the faults that owners, specialists and DVSA data reveal.
When you run a report on a specific Porsche 924, we cross-reference the exact variant, engine and age against our database of 5 known issues. Combined with full MOT history analysis, mileage verification and DVLA data, you get a complete picture before viewing.
Enter the registration for MOT history, mileage verification, known faults for that exact variant, and a Get Car Wise Score.
This guide was compiled from independent expert reviews, DVSA MOT data, specialist workshops and our own database of 5 known Porsche 924 issues. We are not affiliated with any source listed.