Audi Oxygen Sensor 4H0906262G 0258027056 Original Quality Precise Emissions

Oxygen sensor directly replaces Audi original 4H0906262G and is compatible with 0258027056; a universal downstream oxygen sensor. Monitors exhaust oxygen content and feeds ECU to precisely control the air-fuel ratio for compliant emissions. Fits Audi A8, Q7 on 4H platform; replacement resolves high fuel consumption and weak acceleration and eliminates check engine light. If idle is unstable, exhaust smells of unburned fuel, or fuel consumption spikes, the oxygen sensor may be aging—replace to restore original performance.