BMW E90 Oxygen Sensor Replacement | E91, E92, E93 | Pelican Parts DIY Maintenance Article
Is Your BMW Catalytic Converter Bad??? Easy $5 FIX for P0430 P0420 Codes. - YouTube
P0420 and P0430 codes - 5Series.net - Forums
P0420
P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2) - In The Garage with CarParts.com
BMW E90 Oxygen Sensor Replacement | E91, E92, E93 | Pelican Parts DIY Maintenance Article
P0430 Code: Check engine light came on and got this code. Going to replace O2 sensors first to hopefully get rid of code but cat looks rusted out. What do y'all think