Dorman 904-778 Exhaust Gas Temperature (EGT) Sensor - End of Particulate Filter

Overview of the Dorman 904-778 Exhaust Gas Temperature Sensor

The Dorman 904-778 Exhaust Gas Temperature (EGT) Sensor is designed specifically for select Audi models, including the A6 Quattro, A7 Quattro, A8 Quattro, and Q5. This sensor plays a critical role in monitoring exhaust temperatures to help maintain optimal engine performance and emissions control.

• Compatible with Audi A6 Quattro, A7 Quattro, A8 Quattro, and Q5 models
• Specific fit design ensures precise installation and reliable operation
• Wiring harness length of 290 mm for flexible placement
• Black oval-shaped female connector with two female blade terminals
• Thread diameter of 14 mm with 1.5 mm pitch and male nut thread
• Straight angle sensor tip with a 7 mm width for accurate temperature readings
• Includes one EGT sensor, one bung repair kit, and one zip tie for installation

Detailed Product Description

The Dorman 904-778 EGT sensor is engineered to provide accurate exhaust gas temperature measurements, which are essential for the vehicle’s emission control system. Featuring a 290 mm wiring harness, this sensor offers sufficient length for installation in tight engine compartments. The black oval-shaped female connector with two female blade terminals ensures a secure electrical connection, minimizing the risk of signal loss or interference. The sensor’s 14 mm thread diameter with a 1.5 mm pitch and male nut thread allows for a precise and secure fit into the exhaust system. Its straight angle design and 7 mm tip width enable it to accurately detect temperature changes in the exhaust gases, helping the engine control unit adjust fuel delivery and emission controls accordingly.

Common Applications and Issues Addressed

• Helps prevent engine overheating by monitoring exhaust gas temperatures
• Supports emission control systems to reduce harmful exhaust emissions
• Assists in maintaining optimal engine performance and fuel efficiency
• Detects sensor faults that may trigger check engine lights
• Replaces faulty or damaged EGT sensors in Audi Quattro models

Installation Notes and Tips

Installation of the Dorman 904-778 sensor requires careful handling to avoid damage to the wiring harness and connector. Ensure the sensor is threaded properly into the exhaust system using the 14 mm thread diameter and 1.5 mm pitch specifications. Use the included bung repair kit to address any exhaust port issues during installation. The 290 mm wiring harness length provides flexibility, but avoid sharp bends or kinks to maintain signal integrity. Secure the wiring with the included zip tie to prevent movement or abrasion during vehicle operation.

Quality Assurance and Warranty

Dorman manufactures the 904-778 EGT sensor to meet or exceed OEM specifications for fit, form, and function. This sensor undergoes rigorous testing to ensure durability and reliable performance under demanding conditions. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship to provide confidence in the product’s quality.