Deciding whether to repair or replace a car is one of the biggest financial decisions most people face. Unlike white goods, the maths is more complex — you need to weigh repair cost against the car's current value, ongoing running costs, reliability record, and what a replacement would actually cost you. A £1,500 repair on a £500 car is obviously wrong; the same repair on a £10,000 car is almost certainly right.
Average UK labour and parts costs — always get multiple quotes from local engineers.
A modern car can comfortably reach 150,000–200,000 miles with proper servicing. Most cars become unreliable or uneconomical beyond 10–15 years or 120,000+ miles — not because they physically can't run, but because ongoing repair and maintenance costs increase significantly.
The golden rule: never spend more than the car's current market value on a single repair. For ongoing reliability issues, add up 12 months of expected repairs — if that exceeds the cost of a replacement, it's time to move. MOT failures are worth fixing unless the total cost exceeds £1,000–£1,500 on a car worth under £2,000.
An MOT failure doesn't automatically mean your car should be scrapped. Minor failures like bulbs, wipers, or worn tyres are cheap to fix (£50–£200 total). Even moderate failures — brakes, suspension bushes, exhaust issues — typically cost £200–£600 and are usually worth repairing on a car with reasonable value. The real decision point comes with major structural failures: chassis corrosion, subframe rot, or extensive welding requirements. These can cost £500–£1,500+ to fix and may not be worth it on an older, lower-value vehicle. The average MOT repair bill in the UK is around £250–£400.
These warning signs suggest it may be time to move on:
If you decide not to repair, you have options. Scrap value in the UK typically ranges from £100–£300 depending on the weight of the vehicle and current metal prices. However, you may get more by selling the car as a non-runner on sites like eBay, Facebook Marketplace, or specialist buyers — even a car with a blown head gasket or failed gearbox can fetch £300–£1,000 if the body and other parts are in decent condition. Part-exchange at a dealership is another option, though you'll typically get less than a private sale.
Not sure what to do? Use the free calculator above — answer a few quick questions about your car and get a personalised repair vs replace verdict in under a minute.
Generally yes, if the repair costs less than the car's current market value and the car is otherwise reliable. Use tools like Auto Trader and What Car to check market value before committing to expensive repairs. Never spend more than the car is worth.
Common UK car repairs: brake pads and discs £250–£500, clutch £400–£700, timing belt £350–£600, head gasket £500–£1,500. Always get at least two quotes from independent garages — dealerships typically charge 30–50% more.
Most modern cars can reach 150,000–200,000 miles with regular servicing. Japanese brands (Toyota, Honda) are particularly known for longevity. High mileage alone isn't a reason to replace — service history and condition matter more.
Old cars are often cheaper to run than finance payments on a new one, provided repairs are manageable. A £5,000 car that needs £800 of repairs is usually better value than £350/month finance on a new car. Calculate the real cost comparison before deciding.
It's not worth fixing a car when the repair cost exceeds the vehicle's market value, when the car has multiple known issues beyond the current fault, when it's failed its MOT on structural items like chassis corrosion, or when annual repair costs consistently exceed £1,500–£2,000.
The most expensive common car repairs in the UK are gearbox replacement (£800–£2,500), engine rebuild (£2,000–£5,000+), and head gasket repair (£500–£1,500). Automatic gearbox repairs tend to be significantly more expensive than manual gearbox work.
Repair cost estimates are UK averages sourced from Checkatrade, Which?, and MyBuilder. Prices include labour and VAT. Always get at least two quotes from qualified tradespeople before proceeding with any repair.
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