Mass Air Flow Sensor Audi A4

Product Description

078906461B

The 078906461B mass air flow sensor (MAF) is a high-precision hot-film airflow detection component installed on vehicle intake manifold, specially engineered for VW/Audi/Porsche 2.5L five-cylinder petrol, W12 & V8 turbo engines. It accurately measures incoming intake air mass volume and converts airflow data into standard electrical signal transmitted to ECU. Based on real-time air intake data, ECU precisely calculates optimal fuel injection quantity, calibrates air-fuel mixing ratio, improves combustion efficiency, cuts exhaust emission and optimizes power output & fuel economy. It serves as a direct OEM replacement spare fitting multiple Volkswagen, Audi and Porsche mainstream models.

• OEM Direct Fit: Strictly manufactured per original OE specification No.078906461B, identical intake pipe outer diameter, fixed mounting hole spacing and original 5-pin connector, plug-and-play installation without pipe cutting or extra adapter modification.

• High Precision Hot-film Sensing Chip: Adopts imported automotive-grade hot-film detection core, fast airflow response speed, stable signal output under idle, acceleration and high-speed working conditions, effectively avoid air-fuel ratio deviation.

• High Temp & Anti-dust Durable Structure: Air inlet equipped with integrated protective metal filter screen to block intake dust and impurity; high-temperature resistant PA66 plastic shell with anti-aging coating, stable performance under drastic intake temperature fluctuation.

• Built-in Anti-interference Shield Circuit: Internal shielding wiring design effectively filters electromagnetic interference from ignition coil and alternator, ensuring steady signal delivery to ECU under severe engine vibration.

• IATF16949 Standard QC Control: All finished sensors pass full inspection including airflow calibration test, high-low temperature cycle aging test, vibration durability test and signal consistency test before delivery.

• Airflow Detection Accuracy: Standard tolerance within ±3% of OEM benchmark; contaminated or aged sensing chip causes detection deviation, leading to mixed gas imbalance and poor fuel economy.

• Signal Output Stability: Qualified sensor outputs linear voltage signal corresponding to intake airflow; faulty unit appears signal jump or intermittent loss triggering engine fault code P0101/P0102.

• Ambient Temperature Adaptability: Normal working range from -40℃ ~ +125℃; inferior products drift detection value under extreme cold or high engine compartment temperature.

• Rated Service Life: Standard effective service mileage:90,000~180,000 KM; service life shortened by unfiltered dirty air, engine backfire oil splash and long-term high-load driving.

• Supply Rated Voltage: Standard 12V DC power supply from vehicle onboard circuit, overvoltage will permanently damage internal sensing chip.

• Front Air Filter Grid: Integrated metal mesh filter blocks sand, dust and foreign particles from entering sensing core to avoid chip abrasion and signal failure.

• Hot-film Sensing Core: Core detection component with platinum thermal film probe, real-time capture airflow speed & air density data and convert into electrical signal.

• Internal Control PCB: Onboard amplification & filter circuit stabilizes original sensing signal and eliminates clutter interference before ECU transmission.

• Integrated Plastic Housing: High-temperature engineering plastic shell with integral mounting flange, one-time injection molding for airtightness and anti-vibration.

• Pin OEM Electrical Connector: Original standard black automotive plug with tin-plated anti-oxidation terminals, built-in waterproof rubber ring for damp-proof and stable circuit connection.

This sensor is a direct replacement for the following OE numbers:

028906461, 028906461X, 038906461B, 038906461BX, 059906461B, 059906461BX, 06A906461G, 0280218038, 0280218039, 028021808, 0280218212, 078906461B, 078906461BX, SU5412

• Disconnect vehicle battery negative pole before installation to avoid ECU circuit short-circuit damage.

• Clean intake pipeline inner residual dirt and oil stain to prevent impurity entering new MAF sensor after mounting.

• Never wipe or touch internal hot-film sensing probe by hand; fingerprint grease will cause permanent detection inaccuracy.

• After installation, connect OBD diagnostic scanner to clear relevant air flow fault codes and conduct road test to check acceleration & fuel consumption performance.

• Replace the sensor when facing obvious fuel consumption rise, acceleration weakness, unstable idle speed or illuminated engine malfunction warning lamp.

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