M Mosephus New member Jan 29, 2011 #16 Does anyone know what side (drvr/pass) the P0421 code (Warm Up Catalyst Efficiency Below Threshold (Bank 1)) is referencing to? I used to know :/
Does anyone know what side (drvr/pass) the P0421 code (Warm Up Catalyst Efficiency Below Threshold (Bank 1)) is referencing to? I used to know :/
