Subaru Workshop Manual. Wiring Diagram. DTC

This page contains a complete guide to servicing, diagnosing, and repairing Subaru vehicles. Includes:

🔹 Wiring Diagrams – detailed wiring diagrams for all vehicle systems.

🔹 Diagnostic Trouble Codes (DTCs) – decoding OBD-II errors, possible causes, and troubleshooting methods.

🔹 Diagnostic and Repair Procedures – step-by-step instructions for troubleshooting electronics, engine, transmission, and other systems.

Useful for Subaru owners, mechanics, and auto repair shops.

• Subaru Engines Workshop Manual>>
• Subaru Electrical Wiring Diagram>>

📌 The most reliable Subaru models

1. Subaru Forester (SJ, 2013–2018)

✅ Why it’s reliable:

The proven 2.5-liter naturally aspirated engine (FB25) is reliable and long-lasting.

Improved Lineartronic CVT – fewer problems than in the previous generation.

Excellent cross-country ability and strong suspension.

⚠️ What can let you down:

Oil consumption on early FB25s (before 2015), later fixed.

The CVT requires oil changes every 40-60 thousand km.

2. Subaru Outback (5th generation, 2015–2019)

✅ Why it’s reliable:

The 2.5 (FB25) and 3.6 (EZ36) naturally aspirated engines are very long-lasting.

Spacious and comfortable interior, good sound insulation.

High ground clearance (213 mm) – great for bad roads.

⚠️ What can let you down:

The CVT requires maintenance (oil change).

Weak standard battery.

3. Subaru Impreza (3rd generation, 2007–2011)

✅ Why it’s reliable:

Naturally aspirated engines 1.5, 1.8 and 2.0 liters – simple and durable.

Excellent handling and all-wheel drive.

Classic 4AT automatic transmission – more reliable than the CVT.

⚠️ What can let you down:

Body corrosion, especially arches and sills.

Poor sound insulation.

❌ The most problematic Subaru models

1. Subaru Forester (SG, 2002–2008) with a turbo engine

🚨 Why it’s problematic:

Turbo engines (EJ255, EJ205) – prone to overheating and piston failure.

Weak radiator and thermostat – engine overheating.

Problems with the gearbox (especially the manual – weak 5-speed version).

⚠️ Advice:

Naturally aspirated versions (EJ20, EJ25) are much more reliable.

2. Subaru Legacy (2010–2014) with a CVT

🚨 Why it’s problematic:

Early Lineartronic CVTs (TR580, TR690) – prone to overheating and failure.

Problems with ignition and oil consumption in early FB25s.

Expensive spare parts for repairing the suspension and gearbox.

⚠️ Advice:

It is better to look for a version with a 5- or 6-speed manual.

3. Subaru WRX STI (2015–2021) with an EJ257 engine

🚨 Why it is problematic:

The EJ257 is an engine with factory problems (thin piston walls, overheating).

Frequent breakdowns of the oil pump and liners.

High maintenance and repair costs.

⚠️ Advice:

If you buy, only with competent maintenance and regular diagnostics.