← Subaru WRX (GD/GG, 2002-2007) problems

Rod-bearing wear on the 2.0L EJ205

Confirmed · Severity: High · Years: 2002-2005

Symptoms

Rod knock, low oil pressure; bearing wear can be silent until a bearing spins, often under full boost near redline.

Cause

Sources tie it to long oil-change intervals and cheap oil, and to the wide factory bearing-clearance tolerance. One shop reports it on stock, unmodified cars and says it is not caused by tuning. MotorTrend says the 2.5L engines see it less. Grassroots names the No. 2 rod bearing as a next-to-fail item.

Fix (summary)

Short oil intervals with quality synthetic, periodic oil analysis and oil-pressure monitoring; budget for engine work before heavy modification of a high-mileage car.

Sources

• The Subaru WRX EJ205, engine bearings, and you. — Innovative Tuning (vendor article; read 2026-10-15; search excerpt only)
• The Truth Behind The Subaru EJ-Series Engines - Tech-Knowledge — MotorTrend (editorial; read 2026-10-15; search excerpt only)
• Insider guide: Make the most of your 2002-'07 Subaru Impreza WRX — Grassroots Motorsports (Feb 2009 issue) (editorial; read 2026-10-15; full page read)

Summaries are in our own words. Not repair instructions; consult the factory service manual.