Is there any other way to tell if your o2 sensors are bad other than a possible CEL, or checking the OBD1 codes? I read the codes and got a system pass, not a single code thrown for anything. Just trying to figure out the cause of my below average gas milage.
PS: I think my car has MIL eliminators or whatever they are called, that block the CEL. I think my car has them because when I put on my O/R x pipe my check engine
didnt come on like I thought it would.