Ok

I am having intermitant issues with the New jeep today it was acting up again. How would one test the O2 sensors to see if they are bad ?


Todd

With a good quality graphing scan tool. It should change multiple times a second over and under 0.5 volts if I recall correctly. It's been 10 years since I used to do it though so my memory could be bad. I don't know about now but back then only the O2 sensors before the cat convertor were important. Those would change engine performance. The last set of O2's were there just to make sure the convertor(s) were working but made no engine mod's.

Ok I will just replace the first one and see what happens prolly has never been changed before anyways it has 225000 on it

Buy a good quality one like Bosch. Also check your exhaust header manifold and collector piping. They are known to crack and will introduce air into the system that didn't go through the combustion process. This fools the O2 sensor into seeing more air and changing the air fuel ratio. Usually a bad O2 will send a code however a lazy O2 won't. Again atleast back in 2000 when I stopped doing repair.

You're right on.

I found the issue yesterday


It was a bad tps replaced it and all is good




Thanks for the help guys .