Author: Subaru EndWrench

An owner of a 1996 or later Subaru vehicle may require your expertise because the on-board diagnostic system has detected a fault. This sophisticated system can tell you whatʼs wrong, if you know how to listen.

Periodic inspection of a vehicleʼs suspension systems and wheel alignment assures the best possible combination of ride quality, handling
and tire life.

As fuel is pumped into the tank, fuel vapors are displaced. These vapors are trapped by the on board refueling vapor recovery system before they can escape into the atmosphere via the fuel filler neck. Diagnosis and testing of this system requires special procedures.

Subaru vehicles are equipped with either a Conventional or Enhanced Evaporative Emissions Control System. Each system uses a different method to prevent unburned hydrocarbons from escaping to the atmosphere.

Internal and external changes require viewing the 4EAT Phase 2 as an entirely new automatic transmission. Because it is unlikely that you will be disassembling a Phase 2 transmission in the near future, this article will concentrate on principles of operation and failure diagnosis.

The Subaru 4EAT transmission is a four speed,
microprocessor-controlled transmission. Changes
in your diagnostic approach, due to these electronic
transmission controls, are required.

The 2.0 liter WRX engine is the first turbocharged Subaru engine since the 1994 Legacy 2.2 liter. This article explains the technology found in this new engine, as well as several important service procedures and cautions.