OBDII OBD I

[alexander]

I have a 96 Q. I have been asked if it is a OBD I OR OBDII.

How do I find out.

[maxnix]

You have OBDII.

RTFSM

And compleete your profile so we who don't like to look at the same picture 20 times in a thread and have signatures turned off can know.

Thanks.

[Q45tech]

OBDII is an ADD ON to OBDI.

ODBI just checks wheter sensors are working [not shorted or open] whereas OBD2 test whether the sensor output is within +- 20% of the expected value [brand new value]. When parameters change enough so that the emissions could be out of whack by 20% you get a MIL.

Early OBD2 didn't work too well*, as the manufacturers tried to adapt to old engine designs whereas after 2-3 years they got it right by 2000.

* intentionally set very coarse [insensitive] to avoid MIL lights.

OBDI requires a dyno to check emissions and OBD2 uses computer and physical exam.............O2 sensors and cats installed, no tampering, no MIL and ecu reports ready for testing.

1996 [so do 97-99] has both OBDI and OBDII connectors for trouble shooting.

[alexander]

Thanks for the input.I'll take it back to Infiniti of marin and have them do a more comprehensive test.