2001 PT Cruiser 2.4L upstream O2 sensor issue
My 2001 PT Cruiser (2.4L with manual transmission) was throwing codes of
a bad O2 sensor heater on the upstream sensor. I replaced both sensors
(upstream and downstream) with new Bosch sensors from Advance Auto
Parts.
Now I'm getting a new code showing PO134 "O2 sensor circuit no activity
detected (Bank 1, Sensor 1)". Scan tool shows the O2 sensor voltage
fluctuating between 0.48V and 1.28V. Online sources claim the sensor
should not register a voltage above 1.0V (super rich) or below 0.1V (super
lean).
I replaced the O2 sensor with an identical one and got the same error. I'm
starting to suspect it doesn't like the Bosch sensor even though it's the
correct part number. A friend tells me Chryslers are very particular about
accepting non-OEM parts.
Anyone got any experience with this issue?