Hella 009403421 Exhaust Gas Differential Pressure Sensor - Front

HELLA Exhaust Gas Differential Pressure Sensor

The HELLA Exhaust Gas Differential Pressure Sensor monitors pressure differences in the exhaust system to help maintain accurate EGR operation and emissions control. Built with corrosion-resistant materials and a durable housing, this sensor is made for reliable performance in demanding underhood conditions. Part number 009403421 is a direct-fit style replacement for select BMW diesel applications.

Key Features

• Measures exhaust pressure differential for EGR and emissions system feedback
• Corrosion-resistant construction for long-term durability
• Bolted mounting type for secure installation
• 3-pin connector design
• 8 mm / 0.31 in diameter connections
• Precise fitment for accurate sensor readings

Detailed Product Information

This HELLA exhaust gas differential pressure sensor, part number 009403421, is engineered for select BMW diesel models including the 2014-2018 BMW 328d, 2014-2018 BMW 328d xDrive, 2014-2016 BMW 535d, 2014-2016 BMW 535d xDrive, and 2015 BMW 740Ld xDrive. It measures exhaust pressure differences so the engine control system can monitor exhaust flow and EGR-related operation with the correct signal input. The bolted design and 3-pin connector support a secure, OE-style replacement on the front position.

This part cross-references Bosch 16144 for the same application.

Common Issues This Sensor Can Address

• Fault codes related to exhaust pressure differential sensor performance
• Incorrect exhaust pressure readings in the EGR system
• Emissions control faults tied to sensor signal loss or drift
• Driveability concerns caused by inaccurate exhaust feedback
• Physical damage or corrosion at the sensor body or connector

Installation Notes and Tips

Installation requires qualified personnel. Confirm the 3-pin connector, bolted mounting style, and 8 mm connection dimensions before replacement. For best results, inspect the exhaust system, wiring, and connector terminals for corrosion or damage before installing part number 009403421. Verify front-position fitment on the specific BMW model before service.

Quality Assurance

HELLA manufactures this sensor with corrosion-resistant materials and durable construction to support consistent operation in exhaust-system service. Precise fitment helps promote accurate sensor performance on the listed BMW applications.