Cadillac dts sunroof 2006 p0420 P0420 catalyst system efficiency below threshold (bank 1) Sensor o2 oxygen p0420 bank p0140 circuit clean catalyst code efficiency below system catalytic threshold converter low sensors located engine
P0420 Catalyst System Efficiency Below Threshold (Bank 1) | The Motor Guy
2006 cadillac dts P0420 – catalytic converter system, bank 1 -efficiency below threshold P0420 sensor p2240 catalytic converter threshold oxygen located troublecodes heated causes
2006 Cadillac DTS - P0420 Repair - YouTube
P0420 Catalyst System Efficiency Below Threshold (Bank 1) | The Motor Guy
P0420 – Catalytic converter system, bank 1 -efficiency below threshold