Rule of thumb: if the repair cost exceeds 50% of the car's market value AND further large repairs are likely soon, it usually isn't worth it.
Here's a quick, honest answer from a working UK mechanic — what causes it, what it costs to fix, and what to do next.
What about EVs? — Battery replacement on older EVs is the equivalent of an engine swap — often uneconomical. Hybrid battery replacement is more affordable.
Should I get multiple quotes? — Yes — for jobs over £500, two written quotes is sensible.
Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email bob@bobsmechanicalrepairs.co.uk.