Air / Fuel Ratio Sensor for 2002-2004 Volkswagen Passat & More - NGK O2 SENSORS 24321

NGK O2 SENSORS 24321 air / fuel ratio sensor for the 2002-2004 Volkswagen Passat W8 4.0L and other vehicles measures the air-fuel ratio in the exhaust for the engine computer. Unlike a conventional switching sensor that only reports rich or lean, it lets the ECU make continuous, precise adjustments to the air-fuel mixture.

• Wideband 5-wire design with a linear output signal
• Vibration and thermal shock testing during development, plus testing during manufacturing
• 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects the ceramic element against poisoning
• Dual-coated platinum interface and thinner ceramic element for quick light-off and response times

Quick facts

• Part: NGK O2 SENSORS 24321 air / fuel ratio sensor
• Fits: 2002-2004 Volkswagen Passat W8 4.0L and other vehicles
• Position: Upstream, upstream left, upstream right
• Condition: New

A worn air / fuel ratio sensor can show up as a check engine light, poor fuel economy or rough running, but those signs have other possible sources too. With the engine off and cool, look over the sensor's wiring and connector for damage. A shop scan tool can then confirm whether the sensor is at fault. This listing is one sensor, and each upstream position takes one.

Fits

This sensor is listed for a wide range of Volkswagen, Audi, BMW, Mercedes-Benz and Porsche models, among them the 2005-2011 Audi A6 Quattro V8 4.2L and the 2007-2008 BMW Alpina B7 V8 4.4L. Open the "Vehicles it fits" section to check your exact model and engine.

Specifications

Installation notes

• The sensor is equipped with water-resistant connectors and harness accessory hardware for easy installation.