Compare Hyundai I20 ECU repair quotes from specialist garages

The i20 is a practical, efficient and stylish small car, making it a popular choice for urban commuters. There is a more exciting side to this model, too, because it is used as the basis for Hyundai's rally car, competing in the World Rally Championships (WRC).

At the 2023 WhatCar? Awards, the Hyundai i20 N was crowned 'Hot Hatch of the Year' - a highly sought-after title - earning praise for its "brilliant body control and grip". Two years before, it was also named 'Car of the Year' at Top Gear's annual awards. The most recent generation of the i20 is exceptionally reliable; in earlier models from 2009-15, watch for signs of clutch wear and blocked DPFs in diesel engines.

ECU stands for engine control unit, sometimes referred to as the engine control module (ECM). This component ensures your car's engine runs smoothly by, for example, determining the amount of fuel that goes into the cylinders. You can find out more about how it works here.

Signs of a faulty ECU include misfires, the check engine light, starting problems, and engine surges or lags. ECU testing and repairs can help you work out the cause of the problem, such as faulty wiring or a bad sensor.

ECU testing uses a diagnostic tool known as an OBD scanner, which extracts information from the car's computer and allows the technician to check fault codes.

Can an ECU be repaired? Most of the time, the answer is yes; the ECU can be reprogrammed or repaired. The same applies to water damaged ECUs, as long as the damage is minimal. Some technicians may offer mobile ECU repairs at a location that's convenient for you.