Checking idle speed and exhaust gas composition (Opel Vectra C)

On heavily used vehicles (taxi, rental) this check should be performed annually, under normal operating conditions it will be sufficient to perform it once every two years. The check consists of testing the engine management system using a special device connected to the diagnostic connector (see Chapter 5). During diagnostics, fault codes are read from the memory of the electronic engine control module (ECM). Due to the need to use special expensive equipment, this type of diagnostics is performed at a service station. The composition of exhaust gases is monitored using a special gas analyzer and is usually included in the number of routine checks carried out when a car undergoes a state technical inspection. If desired, this check can be performed at most service stations.