Trailblazer 4.2 liter Code PO030 HO2S Heater Control Circuit Where's this located ?

Question

Trailblazer 4.2 liter Code PO030 HO2S Heater Control Circuit (Bank 1 Sensor 1) Where's this located ? Thanks, AWB

Answer 1

This is the fron O2 sensor in the exhaust stream. So it is normally located in the exhaust manifold or in the exhaust pipe before the converter. Bank 1 , sensor 1. sensor 1 meaning the first sensor. The heater circuit is part of the O2 sensor itself.