Subaru Legacy: Common Codes & Fixes

Real-world diagnostic data for the Subaru Legacy. These are the codes techs see most often. Tap any code for the full vehicle-specific fix and the exact part.

6 codes have specific fixes for the Subaru Legacy

P0129 BARO low on Subaru EJ25 — combined MAP/BARO sensor fails intermittently. 2006-2012 · Easy DIY · 30-45 min P0410 The secondary air pump valve (reed valve) sticks closed from carbon buildup on Subaru boxers. 2006-2014 · Moderate DIY · 1-2 hours P0431 Bank 2 warm-up cat failure on Subaru is the passenger-side cat. 2010-2020 · moderate to hard DIY · 2-3 hours P0491 Subaru Secondary Air Injection pump fails after water intrusion -- the pump lives in the fender well and rusts internally. 2006-2014 · moderate DIY · 2 hours P2097 P2097 (rich downstream) points to a leaking fuel injector or failed catalyst. 2006-2014 · moderate DIY · 2-3 hours P2101 Corroded connector on the throttle body. 2006-2014 · easy DIY · 30 min

Frequently Asked Questions

What are the most common check engine light codes on a Subaru Legacy?

The most commonly reported OBD-II codes for the Subaru Legacy include P0129, P0410, P0431, P0491, P2097. Each code indicates a specific issue -- tap any code above for the full diagnostic breakdown.

How much does it cost to fix a check engine light on a Subaru Legacy?

Repair costs vary by code. Many Subaru Legacy fixes like gas cap replacement, sensor cleaning, or spark plug changes are under $50 in parts and can be done at home. More complex repairs like catalytic converter or transmission work can run $500-$2,000+ at a shop.

Can I drive my Subaru Legacy with the check engine light on?

It depends on the code. A steady check engine light usually means you can drive short distances safely. A flashing check engine light means stop driving immediately -- continued driving can cause serious engine damage. Scan the code first to know what you are dealing with.

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