Codyizs1kc

So I bought an xj with obd1 in it and I wanna keep it so I need to redo what work some genius did and I wanna put ob2 back in so I can drive on the road!! I'm not scared of work so if anyone knows tell me what exactly I need to do to do this job!!!!!! Please

PatHenry

Are you sure it was originally OBD2 and converted? Early 96's were OBD1 from the factory (if you're drivers door sticker indicates it was made in '95 it could be OBD1)

Codyizs1kc

No it's originally a ob2 from door, engine bay and engine block

firebane

Going from OBD2 to OBD1 is no small undertaking. Perhaps give us some further information on what was done.

PatHenry

Like firebane mentioned, that's a major undertaking. Do you know why a PO did that? I'm wondering if it's the case where the PO put an older computer in it or something like that.
I'd assume that screwing with the OBD2 system is illegal in most or all states.

If you don't have access to the person who did the change you may be in for a major undertaking of tracing wiring using diagrams from the FSM.

Codyizs1kc

Well idk who did it so that doesn't help but I'm quite sure you don't need to change ecu from what little I found on this but idk what other details would you need?

00t444e

Why does it have to be obdll to drive on the road?

PatHenry

I was merely speculating about why one would even consider replacing an ODB2 with an ODB1.
If you are certain the ECU is original, then that's a plus.

Details-wise, it would be helpful to know whatever details you know about the modification. Are you certain it was replacing ODB2 with ODB1 or is it just that your ODB2 was hacked and is malfunctioning. What have you found that is modified, does anything work, etc?

firebane

Sensors, computers, wiring, etc can all be different.

Codyizs1kc

Because I live in n.y and our inspection you have too get hooked up threw the ob2 too make sure you don't have any check engine issues it sucks but I'm trying to work threw this

PatHenry

In MA at least, one of the inspection checks is the ODB2 system and the emissions testing actually hooks into the ODB2 port.

Fortunately for me, my 95 is exempt from emissions testing (I actually think this could be due to not having ODB2..).

00t444e

Ok I didn't think of that we don't have inspections here.

Codyizs1kc

The exhaust doesn't have a cat so pretty much everything was change out but idk that's why I wanna know how to do cause I willing to change everything out I have a 01xj that I can change everything with beside harness cause it's auto

PatHenry

The 01 is going to have a ton of stuff that won't directly swap out. There was a recent thread re: the fact 01's have a pre-cat exhaust with multiple O2 sensors.
My 95 has a single cat located near the crossmember. You'll need to get an OEM compatible cat (I'd get a "direct fit" since you don't want to screw around in a tough inspection state) which should have a hanger that connects up with the transmission mount.

Is the rest of the exhaust OEM or not? How many O2 sensors does it have currently and where are they?

Codyizs1kc

It has a 02 sensor just below the headers and the 01 only has a extra 02 sensor on the cat do that wouldn't be hard at all