Audi A8/S8 Front Oxygen Sensor 0258027027 Replaces 4H0906262H/N

This replacement part matches OEM standards in material and process; high-temperature ceramic core and anti-corrosion stainless steel housing; durable under exhaust system high temperatures and chemical corrosion. OEM 0258027027, compatible with 0258027025, 0258027023, 0258027021; directly replaces Audi original 4H0906262H/N for A8 and S8. Monitors air-fuel ratio and sends signal to ECU to adjust injection, ensuring combustion efficiency and emission compliance. Installation replacement difficulty: medium; requires removing oxygen sensor interface near exhaust manifold; use a special tool to avoid thread or harness damage.