What do coding, cloning and immobilizer pairing mean when replacing an engine ECU? When are they needed, and what should you check before the job?

Should a faulty engine ECU be repaired, or replaced with a used or new one? A comparison of cost, time, risk and warranty.

Dead gauges, a blank display and warning light problems can be signs of an instrument cluster fault. Causes and what to check when replacing it.

7 things to check about part number, software version, physical condition, warranty and coding when buying a used engine ECU.

What does the UCH do in Renault Clio, Megane, Kangoo and Trafic vehicles? Fault symptoms, causes and what to check before replacement.

What do the BSI and BSM do in Peugeot and Citroen vehicles? Fault symptoms, common causes and what to check before replacement.

An ABS light, ESP warning and communication errors can indicate an ABS module fault. Symptoms, possible causes and the right diagnostic steps.

How do you read the hardware, software and vehicle manufacturer numbers on an engine ECU label? A label guide for Bosch, Siemens/Continental, Delphi and Marelli.

What Is a Car ECU? What Do the Engine ECU, ABS, Airbag and Body Control Modules Do? Modern vehicles have electronic control units that manage many systems. These control units are commonly referred to as the car's brain. Car ECUs control many different areas such as the engine, brakes, airbags, comfort systems, transmission, climate control, lighting and security systems. For a vehicle to run smoothly, safely

How Can You Tell If an Engine ECU Is Faulty? What Are the Symptoms? The engine ECU is one of the most important electronic modules controlling the vehicle's engine management system. Also known as the ECU or ECM, this part manages many processes such as fuel injection, ignition, sensor data, turbo control, idle and engine performance. A fault in the engine ECU can directly affect the vehicle's performance. The vehicle may