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Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be be posting a replay ASAP
you have oxygen sensor monitor not ready, why are we changing coolant sensor ?
how many miles on vehicle ?
do you have a scanner than can read o2 sensor live data?
Please let me know
ASE Certfied Technician
if the o2 sensor heater circuit or o2 sensor bad itself it will not finish the monitors for it ,who told you that ?
1- you have bad o2 sensor ( 4 on your jeep 2 upstream and 2 downstream )
2- catalytic converter clogged
3- wiring to o2 sensor damaged
4- PCM ( computer itself )
if the ect ( coolant temp sensor is bad ) it will cause it to run on open loop not closed loop
but it will finish the monitors but show a fault .
since you replaced ect sensor already, so we can take that out of the loop.
o2 sensors needs checked on a scanner ,if they r fluctuating from 0.1 to 0.9 volts
if no scanner available , you can take them out and do a ohm test and compare with a known good one
sorry ford ranger and yes 2 sensors, i got mixed up with another post i m working on he has a jeep :)
sorry about that
if the clogged cat is only partially clogged , you will have full power , but will not finish the monitors .
usually you will feel slight vibration in steering at idle .
ok sounds good
I m online daily from 10 am till 12 pm
ASE Certified Technician