Lexus Repair Questions? Ask a Mechanic for Answers ASAP
P0161 - Oxygen Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
This code is pointing to the heater circuit that is built into the oxygen sensor. This heater is commanded on by the PCM on cold-start situations to get the oxygeen sensor up to normal operating conditions within a matter of seconds. Replacing this sensor should solve your problem.