The NGK downstream oxygen sensor provides accurate exhaust-gas readings to keep your engine running at optimal air/fuel ratio. 3-wire heated design reaches operating temperature faster, reducing cold-start emissions. Air/Fuel Ratio technology delivers the response curve required for OBD-II compliance.

Fits: 2000-2024 Audi A4 (all trim and engine variants).

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NGK Downstream 3-Wire Air/Fuel Ratio Oxygen Sensor OS81578