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Home >> Audi >> 2013 >> S7 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control Systems >> 4.0L - Generic Scan Tool - Engine Code(S): CEUC & CRDB (Transmission DTC Table & Diagnostic Procedures) >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Secondary Air Injection Sensor 1 -G609-, CHECKING >> Function

Secondary Air Injection Sensor 1 -G609-, CHECKING: Function

The secondary air injection system blows air into the exhaust, behind the exhaust valves, via a passage in the cylinder head. The "pressure based secondary air diagnostics" function is used. In this system, the signal from Secondary Air Injection Sensor 1 -G609- is evaluated in the engine control module. The injected air quantity is determined from the pressure level. This extra air injection takes place on a cold-start of the engine for about 45 - 100 s and serves to quickly heat the catalytic convertor(s) for improved emissions.

Special tools and workshop equipment required 

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