Being searching the internet to try and figure my issue out. And this is the first place that has someone measuring 1.25 from scan data.
I see this is a old thread but crossing fingers
1998 Honda Civic 1.6
Primary and secondary o2 sensors newer.
Recently the car has been bogging at light cruise 40-50mph
Then it suddenly goes away and has power when the throttle was same position the whole time. I have not data logged what exactly what the ecu is doing.
I’m assuming it’s trying to run a test on secondary 02 sensor.
Then some times it will set a p0136 and 138 right after the bogging disappears.
I’m confused because the data for sensors does read 1.25 both front and rear on start up.
Then primary starts to switch as it goes into closed loop. Which shows on scan tool data
But the rear continues to read 1.25 and I have even unplugged it and it’s .5-.6 range directly from sensor.
But plugged in still reads 1.25 scan data
I haven’t gone as far to read the sensor signal at the ecu. Possibly a break in the wire or internal ecu damage( water etc)
My parents have a similar car and it as well starts with 1.25 for both sensors. But it’s secondary O2 heater circuit is open and setting code.
So I can’t fully test it to see what happens to the readings when
Thanks for any tips.