Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture LEMARK "LLB800" - Not availableVW - Golf, Scirocco, Touran; AUDI - A4, A3, A5, A6, TT, A8, S6, Q5, Q3, A1, Q7