Adjusting idle speed and CO content in exhaust gases (Mercedes-Benz E-Class W124)

To check the idle speed and CO content in the exhaust gases, it is necessary to use an accurate tachometer and an exhaust gas analyzer. If the measured values do not correspond to the required values, the adjustment must be made at a service station using special diagnostic equipment. Since neither the idle speed nor the CO content are adjusted manually.

The diagnostic connector for connecting special equipment is located in the wiring harness of the engine management system. Using special equipment allows you to quickly and easily identify a malfunction in the engine management system. Checking the engine management system without special equipment by the exclusion method takes a lot of time and does not always give positive results. At the same time, there is a risk of damage to the electronic control unit ECU.

[Article was borrowed from the website MERCEDESMAN]