80 mm Mass Air Flow Sensor for 1.8T Engines (Square)

80mm Mass Air Flow Sensor Upgrade for 1.8T Engines – Ideal for K04 & Garrett conversions

Maximum Air Mass for Maximum Performance: Our 1.8T Air Flow Meter (AFM) Upgrade is an essential component for any serious performance upgrade. Anyone upgrading their 1.8T engine to a larger turbocharger will quickly reach the measurement limits of the stock LMM housing. This upgrade housing features an enlarged connection diameter of 80 mm and is therefore capable of precisely measuring and processing a significantly higher air mass.

This upgrade is the perfect foundation for extreme performance gains, such as those achieved when converting from a 1.8T to K04-001 or in high-performance setups with Garrett GT30 turbochargers . The control unit receives precise values for optimal fuel injection even at high boost pressure.

Important: Select the correct connector for your setup

To make installation as easy as possible, we offer the upgrade mass airflow sensor compatible with both electronic generations of the 1.8T. When ordering, please select the connector type required for your vehicle:

Option 1: Oval connector (D-shape) – For newer 1.8T engines with ME7 electronics

This version is compatible with newer engines featuring electronic throttle technology and the Bosch ME7 engine control unit.

• Most Important Engine Codes (MKB): AUM, AUQ, BAM, AMK, ARX, AWT, AVJ, BFB, BVP, APP, ARY, BVR, BEX, BFV
• Typical Vehicles: VW Golf 4 GTI (late models), Audi A3/S3 (8L), Audi TT (8N), Audi A4 (B6), Seat Leon Cupra R (1M), Skoda Octavia I RS

Option 2: Rectangular connector – For older 1.8T engines with Motronic M3.xx electronics

This version is compatible with the early generation of 1.8T engines featuring a classic mechanical throttle cable.

• Most Important Engine Codes (MKB): AGU (large channels), AEB (longitudinal engine), AQA, ARZ, APU, ANB, APH, AJQ (early models)
• Typical Vehicles: VW Golf 4 GTI (early models from 1997 onward), Audi A3 (8L, 1996–1999), Audi A4 (B5, 1995–1999), VW Passat (3B)

Technical Specifications at a Glance

• Connection diameter: 80 mm (outer)
• Applications: Turbo conversions (e.g., K04-001, K04-023, Garrett GT28, GT30, G-Series)
• Material: High-quality, temperature-stable plastic housing
• Advantage: Prevents the mass airflow sensor from “saturating” at high boost pressures

Scope of Delivery and Installation Instructions

Contents: 1x 80mm airflow sensor housing upgrade, including sensor (connector type as selected).

Technical Note for Tuners: Since the larger housing diameter of 80 mm changes the flow characteristics and signal voltage of the sensor, the engine control unit must be tuned (programmed) for the new mass airflow sensor.