What does code P0430 mean on a Subaru and is it safe to drive?
P0430: Catalyst System Efficiency Below Threshold (Bank 2). Here's what it means on your Subaru, what usually causes it, what repairs typically cost, and how safe it is 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 for your 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 Subaru, repairs for P0430 often fall between $400 and $2400, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
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