A CAR expert has shared a rare trick to prevent you from spending money on the wrong purchases.

The motors expert shared one of the most useful gadgets you can buy when it comes to saving money on car expenses.

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The video was shared on TikTok by a user called Official Tall Guy (@thatonetallguy4100), who shares all manner of content.

“Don’t get scammed this car buying season!” reads the post’s caption.

In it, Tall guy asks car shoppers to be careful when buying used cars and suggests the use of a $20 gadget.

“I’m gonna show you the importance of a OBD2 scanner when buying a used car this tax season,” he said as he walks through the car dealership.

Once inside the vehicle, Tall guy shows off the scanner, which looks like an old school phone with four big buttons.

He explains why it’s so useful.

“This tool can save you thousands upon thousands of dollars,” he said.

“I’ll show you how this thing works,” he said, connecting the tool to the lower part of the car’s dashboard.

“That’s your OBD2 port,” he said, showing the port on camera.

He plugs in the scanner and it turns on, reading some codes onscreen.

The tool allows you to read the car’s stored codes, which contain information that could have been hidden by the seller, revealing the true state of the car.

By having this information, shoppers are better equipped at making used car purchases.

“These tools can save you a lot of money,” he said near the end of the clip.

“It can let you know the last time when the codes were reset, if there’s an issue with the transmission or the emission system.

“Invest in one of these right here,” he concludes.

Viewers shared their thoughts in the comments section, with some claiming that they like to take the cars they’re considering buying to an AutoZone in order to ensure that the vehicle is in good health.

“Yea most private sellers aren’t going to let you do that,” replied Tall guy.