Drivers are being told to sell their cars straight away if they see a certain warning light on the dashboard. A car expert says that one particular sign means it’s time to say goodbye to your vehicle.

Scotty Kilmer, who has been fixing cars for 56 years and is popular on YouTube, said: “Today I’m going to tell you when it’s a good time to get rid of a used car. Now this one has a perfectly smooth running engine but the transmission occasionally gives a big clunk when it shifts.”

He explained further: “Now it wouldn’t do it for me in a half-hour drive so now is the time to get rid of it because fixing a 4×4 with an automatic can be a huge expense, so if you’re going to sell a used car, sell it before it breaks down entirely. But just make sure you let them know what they’re getting into.”

Changing a gearbox can cost a lot usually between £500 and £2,500. The price changes depending on what car you have and how big the engine is, reports Birmingham Live.

Instead of getting a new gearbox from the car’s main dealer, garages might find one that’s been fixed up already to save money, Moneybox says. The gearbox is important because it takes the power from the engine to the wheels and gets your car moving. The system uses a set of gears to control your car’s speed and torque, ensuring the best performance in all driving conditions. The average cost for a small car can range from £800 to £1,500, including labour, warns Moneybox.

For sedans, the cost is even higher – averaging between £1k to £2,000 – including labour. SUVs can cost between £1,500 to £3k, according to the experts’ estimated cost range. They also warn that vans can be more expensive, where drivers could end up paying anywhere between £2,000 and £4,000.