Volkswagen Superb Oxygen sensor 021906265AK replacement 0258003630

Volkswagen Superb (Sagant) oxygen sensor (OEM number 021906265AK/ replacing 0258003630) installed either in the exhaust manifold or the front exhaust pipe; it monitors exhaust oxygen and feeds back to the ECU to adjust the air-fuel ratio for combustion efficiency and emissions compliance. If the engine fault light is on, idle is unstable, fuel consumption increases significantly, or acceleration is weak, this usually indicates sensor aging. Installation difficulty medium; recommended service time 0.5-1 hour; take care to avoid damage to threads.