Built by people who know the automotive trade inside out.

Why carfaultcodes.co.uk exists

Through Car.co.uk we buy thousands of problem vehicles every year: cars with warning lights on, fault codes active, and owners who don't know what any of it means. Doing that at scale, year after year, we built up a practical understanding of what these codes mean in the real world. Not just the textbook definition, but what typically causes them, how serious they usually are, and what a driver should do next.

We decided to make that knowledge public. carfaultcodes.co.uk is the result: a free library built from that experience, so anyone with a warning light on their dashboard can get a plain-English answer in seconds, not after twenty minutes in a forum thread from 2009.

One search, one clear answer: what the code means, how serious it is, what typically causes it, and what to do next. Free, fast, no small print. And because the site sits alongside Garage.co.uk and Car.co.uk, once you know what the fault is, finding a garage or deciding whether the car is worth repairing is one click away.