Sorry if this has been asked but I couldn't find anything while searching. Where are all of the O2 sensors located? I could only find one upstream (aren't there two?) in the service manual located on the exhaust manifold. What is the best procedure for testing them to be sure they are working correctly? I have seen some stuff about warming them up on the engine and checking the voltages but I'm still a little lost on how to do this.
Thanks,
Josh
Thanks,
Josh