by RX25SE » Sat May 21, 2016 10:49 am
While the code points to a faulty sensor, there are other conditions that will cause this code to log.
This code relates to lower than expected current through the post cat O2 sensors heater circuit. It may well be an open or partial open circuit in the heater but could be any other fault in the circuit that supplies or grounds the heater circuit.
Often *(I dont have a wiring diagram)* the heater circuit is supplied battery voltage via a relay and/or a fuse, so an open circuit fault with these will log the same code.
*Note: Often the model year/engine/symptoms/any other info are handy when asking for help.