Subaru Air Intake Sensor

The Subaru Air Intake Sensor Reference Matrix

1. The High-Volume Modern “Slot-In” MAF Group (Denso 22680AA380)

Introduced during the transition to the FB-series naturally aspirated Boxer engines, it is a highly active, quick-turnover part.

Group A: The Everyday Commuter Core

These three models represent identical electronic signals and physical airbox mounting depths.

• Impreza: Dominates the GP/GJ and early GT/GK generation lineups running the FB20 engine.
• XV & Crosstrek: This is the same chassis; whether badged as JDM “XV” or export “Crosstrek”, they utilize the identical intake tract.
• G4: The high-volume JDM sedan version of the Impreza (GJ/GK series).

Group B: Crossover & Wagon Extensions 

• Forester: SH and SJ generation naturally aspirated models.
• Levorg: The VM4 JDM sport wagon running the 1.6L FB16 DIT turbo engine.
• Exiga: Ya-series crossover multi-purpose vehicle.

2. The Legacy EJ/EZ Engine Generation MAF (Denso 22680AA310)

This bulkier, classic-style insert sensor tracks older multi-point injection engines and heavy-displacement platforms built before the FB-engine family took over.

• Legacy: BL/BP and early BM/BR chassis lines running the EJ20, EJ25, or EZ30 Boxer setups.
• Outback: Shares the exact mid-2000s Legacy mechanical layout.

 

3. The Performance Turbo & Specialized Hybrid Tier

These applications require highly responsive hot-wire configurations tailored for forced-induction spikes or unique dual-powertrain mapping.

• WRX STI Stays isolated on the high-boost EJ257 platform, utilizing specialized heavy-duty air metrics.
• WRX (1 unit): VA-generation running the direct-injection FA20F twin-scroll turbo engine.
• Crosstrek/XV Hybrid Variant Applications: Note: If any of your XV/Crosstrek units are the early Eco-Hybrid models, they bypass the standard AA380 sensor and pull from a specialized 5-pin configuration (22680AA400) shared with the BRZ platform.