2006 Subaru P0430: What It Means & Is It Safe to Drive?
P0430 on the 2006 Subaru: Catalyst System Efficiency Below Threshold (Bank 2). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
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What this code means
Same as P0420 but for bank 2. The catalytic converter on bank 2 is not operating efficiently.
Common causes on the 2006 Subaru
- Failed catalytic converter (bank 2)
- Faulty O2 sensor(s)
- Exhaust leak
Symptoms
- Check Engine Light
- May fail emissions
Typical fixes
- Replace bank 2 catalytic converter
- Replace oxygen sensors
- Repair exhaust leaks
Repair cost range
For a 2006 Subaru, repairs for P0430 typically fall between $400 and $2400, depending on the root cause and labor rates in your area.
Known issues on Subaru
P0430 appears on turbocharged Subaru models with a second exhaust bank. Head gasket integrity is critical to diagnose first—coolant in the exhaust destroys both bank catalysts on the EJ25T engine.
Most commonly affected models
Legacy GT 2005–2009Outback XT 2005–2009