Hella Mass Air Flow Sensor - 8ET 009 149-051
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Product Information
Full details
The Hella Mass Air Flow (MAF) Sensor 8ET 009 149-051 is designed for automotive technicians and DIY enthusiasts looking to restore engine efficiency and fuel economy in compatible Audi and Seat vehicles. By providing OE-quality precision, this sensor ensures the engine control unit receives accurate data regarding incoming air mass for optimal combustion; however, it requires precise installation by qualified personnel to avoid sensor damage or diagnostic errors.
All features
| Model Part Number | 8ET 009 149-051 |
|---|---|
| Brand | Hella |
Extended Product Information
FAQs
Is this a direct fit for all Audi A4 models?
No, compatibility depends on the specific engine code and production year. Please verify your vehicle's specifications before installation.
Do I need special tools to install this sensor?
You will generally need standard hand tools to unbolt the sensor housing and a flat-head screwdriver or socket for the intake clamps.
How many pins does this connector have?
This sensor features a 5-pin electrical connector.
Can I clean this sensor if it gets dirty?
The sensing element is extremely fragile. It is recommended to replace the unit if contaminated rather than attempting to clean it with chemicals.
Does this sensor come with a new gasket?
Ensure you check your package contents; if a seal is included, always use the new one provided to ensure an airtight fit.
Troubleshooting
Engine remains in limp mode after installation
Ensure all engine fault codes have been cleared using an OBD-II diagnostic tool.
Rough idle or poor fuel economy
Check for air leaks in the intake system near the 70mm connection point and ensure the electrical connector is fully seated.
Pros and Cons
Pros
- Matches OE performance specifications
- Precise 70mm connector diameter ensures no leaks
- High-quality housing material for engine bay durability
- Improves combustion efficiency and engine response
Cons
- Installation requires professional diagnostic resetting
- Sensitive electronic components require careful handling
- Verification of vehicle compatibility is mandatory before purchase
Setup, Compatibility & Care
Installation must be performed by qualified personnel to ensure the delicate sensing element is not contaminated or physically damaged during handling. Always disconnect the negative battery terminal before beginning the replacement process to prevent electrical shorts. Once installed, clear any existing fault codes from the engine management system using an OBD-II scanner, as the vehicle computer may have stored 'limp mode' data from the previous faulty sensor. Verify your specific vehicle model and engine code against the 8ET 009 149-051 part number, as Audi and Seat engine configurations vary significantly between production years. Keep the induction system clean and free of excessive oil or debris to prolong the sensor's operational life.