Volkswagen Workshop Service and Repair Manuals

(Automatic gearbox only)

In order to keep the amount of poisonous nitrous oxides (NOx) to a minimum, exhaust gas is recirculated into the combustion air in the part load range.

Control is by way of a valve which opens and closes as a function of the throttle valve position.

Checking EGR valve

• ◆ Minimum engine oil temperature 60 °C

• ‒ Allow engine to idle.
• ‒ Pull vacuum hose off EGR valve.
• ‒ Pull vacuum hose off anti-backfire valve and connect it to the EGR valve. The engine idle should become uneven and the pipe on the EGR valve should get warm.