Some car dealers are charging customers up to Â£180 for a simple 30-minute diagnostic check.
An investigation into the prices charged by franchised dealers uncovered the shocking labour rates and revealed huge variation between dealers within the same brand network.
The survey of costs by maintenance service Motoreasy revealed that while the national hourly labour rate is Â£67, some premiums brands are charging nearly three times that for a simple computer diagnostic check.
Individual dealers for Land Rover, Alfa Romeo, Jaguar and BMW all quoted Â£180 to hook up their diagnostics equipment to a customerâ€™s car. The cheapest dealer was a Honda dealer who offered to carry out the check for free.
Diagnostic checks are carried out by plugging into a carâ€™s on-board computer to find error codes and faults logged.
Top 10 most expensive average diagnostic check quotes
Manufacturer Price 1. Land Rover Â£180 2. Jaguar Â£135 3. Alfa Romeo Â£134 4. Toyota Â£128 5. Mercedes Â£117 6. Mitsubishi Â£117 7. BMW Â£115 8. Volvo Â£ 114 9. Fiat Â£110 10. Kia Â£110
On average, Land Rover was the most expensive brand nationally but also the only manufacturer to quote a standard price across the dealer network. The best value diagnostic checks were to be found at Honda, with dealers charging an average of just Â£38.
For some manufacturers, prices for checks vary massively within the same network. The biggest disparity for a diagnostic check was at Toyota with one dealer charging Â£30 and another quoting Â£155.
Franchised dealers also disagreed on how long the diagnostic check would take, with some telling MotorEasy researchers it was a simple 30 minute job while others claimed they would keep the car for a full day.
MotorEasy founder, Duncan McClure Fisher, said: â€œThe results of our investigation are further evidence of how difficult dealerships make getting a car serviced and repaired. Not only do they use confusing jargon, thereâ€™s no standard pricing that consumers can follow in order to make sure theyâ€™re not ripped off.
â€œThereâ€™s a reasonable expectation that the price for a simple diagnostic check should be the same for your car no matter which dealership in the network you visit but sadly thatâ€™s not the case. The industry needs to clean up its act to start building trust with owners.â€