1994 onboard diagnostics

[Jim Sullivan]

What does 1-2 mean ?

 

[Slamstadam]

You need to give a little more information, however I have been doing my own diagnostics on exhaust and emissions and in that context, 1-1, 1-2, 2-1, 2-2 refers to the O2 sensors fore and aft of the catalytic converter on each side of the dual exhaust.

 

[Jim Sullivan]

I've been showing 1-2 and 1-4 for awhile. I ordered a MAP sensor and the O2 sensor makes sense. Thank a lot.