Audi Q7: Rear Final Drive, Differential

 Secondary Air Injection Pump Relay - J299- / Secondary Air Injection Pump Motor - V101-, Checking

General Description The secondary air injection system sends air into the exhaust using passages in the cylinder head. This extra air injection takes place using the Secondary Air Injection Pump Motor -V101- that is powered by the Secondary Air Injection Pump Relay -J299- on a cold-start of the

 Incorporating the Heating and A/C System in the Coolant Circuit

Notes for Incorporating the Heating and A/C System in the Coolant Circuit   Note In vehicles with a diesel engine with and without a "parking heater", an Auxiliary Heater Control Module -J604- and an Auxiliary Heater Heating Element -Z35- are installed. Refer to → Chapter "Auxiliar