Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture FACET "10.8498" - Not availableAUDI - A3, Q3, Q8, Q7, TT; VW - Caddy, Touareg; BENTLEY - Bentayga; CUPRA - Formentor