LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Audi >> 2015 >> S6 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> 4.0L - Generic Scan Tool - Engine Code: CEUC (Transmission DTC Table & Diagnostic Procedures) >> St Generic Scan Tool >> Diagnosis And Testing >> Diagnostic Procedures >> Secondary Air Injection Sensor 1 -G609-, CHECKING >> Function
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 

scientia non olet · About LEMON Manuals