These 4 Most Expensive Mechanical Problems on Used Cars

Buying a used car can be done with the intention of saving money. Finally, by not purchasing a new vehicle, you avoid the higher price of a freshly manufactured car, dealer markups, and other costs associated with the sale. However, used cars have a long history and many of them have mechanical problems that are common and costly.

GOBankingRates got in touch with some automotive experts to find out what the four most expensive mechanical problems on used cars are – with number one being the most expensive. Here’s what made the list.

Did you know that most of these problems can be prevented with regular car maintenance?

Consider this: 5 new car models for 2025 that will last longer than you think and are worth the money

Trending Now: 9 Things You Must Do to Grow Your Wealth in 2025

Trending now: Suze Orman’s Secret to a Prosperous Retirement – Have you made this money switch?

According to Deege Carse, director at Trackershop, a provider of GPS trackers and vehicle security solutions, transmission problems are common in high-mileage cars, such as used cars, and can cost between $300 and $2,000.

“This price varies and can be even more expensive depending on the car make and model,” Carse explained. “Transmissions have a lot of moving parts that wear a lot over time, and things like a lack of regular maintenance further contribute to breakdowns in used cars.”

Learn more: These 10 used cars last longer than the average new car

Replacing a catalytic converter is an expensive issue when it comes to used cars, often costing between $1,500 and $2,500, according to Tomer Ruderman, founder and owner of Car Keys Ottawa.

“Although it is technically possible to drive without a catalytic converter, I would strongly advise against it as it can harm your vehicle and affect its performance and is not good for the environment,” Ruderman explained. “If you’re thinking about a used car, make sure the catalytic converter is intact and in good condition.”

An automobile’s suspension parts undergo tremendous stress over time, Carse said, adding that this problem is common in high-mileage used cars that have been driven on rough roads for most of their functional life.

“Every pothole and bump wears down your suspension until it is no longer functional and needs to be replaced,” Carse added. “If one or two components need to be replaced, it can cost as little as $100. But the average cost to replace a suspension system can be around $2,000.”

The story continues