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This Hella Mass Air Flow (MAF) Sensor, part number 8ET009149-421, is designed for Mercedes-Benz owners seeking a reliable, OE-quality replacement part to ensure optimal engine performance. Its key benefit is precise air measurement for improved fuel efficiency and engine responsiveness. A potential caveat is the need for professional installation due to its specific fitment requirements. This sensor is manufactured to meet exacting standards, featuring a pipe-neck mounting type, 5 pins, and an 82mm induction pipe connector diameter, ensuring compatibility with specific Mercedes-Benz CLC-Class (CL203) and E-Class (S211) models.
| Model Part Number | 8ET009149-421 |
|---|---|
| Brand | Hella |
Symptoms of a failing MAF sensor include a check engine light, poor fuel economy, rough idling, stalling, and hesitation during acceleration. Your vehicle may also fail emissions tests.
While some experienced DIYers can install it, it's often recommended to have a qualified mechanic perform the installation to ensure it's done correctly and to reset any necessary engine control unit (ECU) parameters.
This Hella sensor is manufactured to Original Equipment (OE) quality standards, meaning it is designed to perform and fit like the original part installed by the vehicle manufacturer.
The lifespan of a MAF sensor can vary greatly depending on driving conditions and vehicle maintenance. However, they typically last for many years or tens of thousands of miles. Regular air filter replacement can help prolong its life.
The induction pipe connector diameter for this sensor is 82mm, which is critical for ensuring a proper seal within the air intake system.
This refers to the method by which the sensor is secured into the air intake ducting. It typically means the sensor has a flange or neck designed to fit into a specific opening and be held in place by clamps or bolts.
Ensure the MAF sensor is correctly installed and the electrical connector is securely seated. Clear any existing diagnostic trouble codes (DTCs) using a scan tool. Some vehicles may require a specific relearn procedure.
Verify the MAF sensor is the correct part for your vehicle and that no air leaks exist in the intake system post-installation. Check for proper connection of the electrical harness.
Confirm the MAF sensor is functioning correctly by checking live data with a scan tool. Other factors affecting fuel economy, such as tire pressure, driving habits, or other engine components, should also be investigated.
Ensure the MAF sensor is properly installed and that the air intake system is free of obstructions. A faulty sensor or an air leak can cause these symptoms.
Compatibility: This Hella MAF Sensor (8ET009149-421) is specifically designed for the following Mercedes-Benz models:
Always verify your vehicle's specific fitment using the part number and OEM references (e.g., 646 094 00 48) before purchase.
Setup (Installation):
Installation of a MAF sensor is a critical task that requires precision. It is typically located in the air intake system, between the air filter box and the throttle body.
Care: MAF sensors are sensitive components. Avoid spraying cleaners directly onto the sensor element. If cleaning is necessary (though not typically recommended for replacement parts), use specialized MAF sensor cleaner and follow its instructions precisely. Ensure the air filter is clean and properly seated to prevent debris from reaching the sensor.
