Volkswagen Santana 2000 1.8 96-04 Rear Oxygen Sensor 030906265AC 0258003829 Exhaust Gas Detection

VW Santana 2000 1.8 (96–04) rear oxygen sensor 030906265AC/0258003829 installed behind the catalytic converter; monitors exhaust oxygen content and feeds ECU to optimize air–fuel ratio for emission compliance and fuel economy. Fits 1996–2004 models; installation difficulty: medium; labor about 0.5–1 hour; thread protection during removal. If the engine fault light is on or fuel consumption rises, the sensor may be failing and replacement is needed.