NGK Audi A4 2010-2009 Direct Fit Oxygen Sensor

What you get here is a direct-fit oxygen sensor from NGK, part number 25729. This sensor is a crucial part of your vehicle's diagnostic system, working to keep the engine running smoothly, get the best possible gas mileage, and cut down on harmful exhaust emissions. It constantly sends information back to the car's computer about the air-fuel mix, and also helps alert you if there's an issue with fuel delivery or the catalytic converter.

NGK is a major supplier of original equipment oxygen sensors, so they know what it takes to make them work right. This particular sensor features an advanced ceramic element that's protected by a three-stage overcoat. This design helps trap contaminants and prevents poisoning of the sensor element, which can happen over time with other sensors. Because NGK controls the ceramic element from the raw material all the way to the finished product, they can ensure a well-built component that's ready to go.

This sensor is designed to fit a wide range of vehicles, including models like the Audi A4, Volkswagen Passat, and Porsche Cayenne. Always check the fitment details to be sure it's the right one for your specific car.