Hello scotty
i have Chrysler 300 touring awd 2008 with 158000 km on it its having check engine light when i scanned it it shows all 4 oxygen sensor bad is it possible all 4 sensor bad at same time or sensors are not getting proper reading because of any other reason
It's unlikley that all four O2 sensor will go bad at one time so we have to assume that its a wiring problem usually. It could be as simple as a bad common ground to make all four not work. In these cases you need to trace the O2 wires back and test them for continuity for grounds, voltages and heater circuit. You can use a DVOM to also check the O2 sensor function as well. But if they all work..all those wires lead back to the PCM so it becomes suspect unless its a bad plug in connection to it.
