What's the difference between a cambelt and a timing chain?
A cambelt, sometimes called a timing belt, is a toothed rubber belt inside the engine. A timing chain does the same job but is made of metal, like a small bicycle chain. Both keep the engine's valves and pistons moving in time with each other. If either one fails while the engine is running, the valves and pistons can collide, and on most engines that means serious, expensive damage.
How do I find out which one my car has?
The quickest way is to check your car's handbook, if you still have it, or look at the service history for a mention of "cambelt", "timing belt" or "timing chain replacement". If you don't have either, a garage can usually tell you from the registration number, or by looking at the engine itself. It isn't something most drivers can tell just by looking under the bonnet, so if you're not sure, ask rather than guess.
Does it actually matter which one I have?
Yes, because they're looked after in completely different ways. A cambelt is a wearing part. It's made of rubber, and rubber perishes with age and heat even if the car hasn't done many miles. Manufacturers set a replacement point, usually a number of years or a number of miles, whichever comes first. A timing chain is metal and lasts much longer, but it isn't truly forever — more on that below.
What happens if a cambelt fails?
On the majority of modern engines, a snapped cambelt lets the pistons and valves meet each other inside the engine while it's still running. That's typically an "interference engine", and the result is usually a very large repair bill, sometimes a replacement engine. This is why cambelt intervals matter more than almost any other maintenance date on the car — missing it isn't like missing an oil change.
Is a timing chain completely maintenance-free?
No. A chain stretches slowly with wear, and the tensioner that keeps it tight can wear too. On some engines a worn chain rattles on cold start-up, or throws a fault code. It's a much longer-life part than a belt, but "chain" doesn't mean "never needs looking at again" — it means the attention it needs is less frequent and less predictable by mileage alone.
Can ONEFIX check what my car has, and how it's holding up?
Yes. Every service at ONEFIX includes a written digital vehicle health check with photographs, so whatever a technician finds when they're working on your car — including anything visible about the belt or chain, tensioners, and general engine condition — is recorded and shown to you, not just mentioned in passing. If you've genuinely no idea whether your car has a belt or a chain, that's a normal, common question, and it's something a technician can confirm while your car is already booked in for something else.
What should I do if I don't know and I'm not sure it's ever been changed?
Don't guess, and don't wait for a noise to tell you. If there's no paperwork and no clear service history, treat it as unknown and get it checked. ONEFIX puts a price in writing before any work starts, so if it turns out your car needs a cambelt change, you'll see the figure and agree to it before anything is touched — nothing is done to your car without your sign-off first. Book a service or ask us to check your history against your registration, and we'll tell you plainly what your car has and what, if anything, needs planning for.