I was just wondering if my car is OBDII compliant or not? I´ve heard that all 95´s are, I´ve heard that OBDII started in ´96 for our cars, and I´ve heard ´95 was a split year (OBDI at first, then halfway through the year OBDII was implimented).
OBDI - On Board Diagnostics ~generation~ one
OBDII - On Board Diagnostics ~generation~ two
Basically it´s a way to monitor and reduce the harmful gasses your car lets out through its emissions. OBDI cars have only one Oxygen sensor, before the cat, while OBDII cars have two O2 sensors, one before the cat and one after.
Hey, does having the OBDII interfere in any way with going to a cat-back exhaust? Is that 2nd sensor located within the cat? If you removed or disabled either/both oxygen sensors, would that effect how the engine ran? Would the computer need a new chip or something to compensate for it?
The second O2 sensor needs to come after the cat. Eliminating this will cause your ECU to throw an error code. It will most likely cause your car to negatively adjust your A/F ratio. On my car I just lengthened the O2 sensor harness and placed it directly after the cat. It works fine like this and the ECU is happy.