My check engine light came on and the code reader said code P0141. I then go through a diagnosis process and replace the oxygen sensor, which fixes the engine light issue and allowed me to pass smog testing.

Parts:
Bosch OE Fit O2 Sensor - https://amzn.to/2MCeAy8 (affiliate)

Tools:
O2 Sensor Tool - https://amzn.to/2OT2jD0 (affiliate)
OBD2 Bluetooth Reader for android devices - https://amzn.to/2w2B9Cq (affiliate)
OBD2 Bluetooth Reader for iOS and android devices - https://amzn.to/2w01FMS (affiliate)
Multimeter - https://amzn.to/2OOrWoi (affiliate)

Bank 1 sensor 2 heater circuit malfunction honda accord 2003 2004 2005 2006 2007 03 04 05 06 07 4 cylinders cylinder cyl four downstream oxygen sensor catalytic converter