ZJ Fault codes

[Big Willy]

Hey everyone. As most of you know I am not at home right now as I am sitting out here in the land of sun and burning sands. But the wife had some codes pulled when the check engine light would come on in the ZJ. My resources out here are pretty limited so I was wondering if anyone had any ideas what these would mean and possible problems.

PO 304- Cylinder 4 Misfire detected
PO 138-O2 Sensor-Bank 1 Serves 2-High Voltage

I am getting her to take it out to Andre but for my peace of mind I was looking for some input here as well. Thanks in advance for the replies. ;D

[Old Yeller]

A bit late replying, but the O2 sensor codes seem to be pretty accurate. I'd start there by replacing it. I found this blerb on the bank location jazz.

" On a V6 or V8 engine, the passenger's side bank on a forward facing engine, or the bank closest to the firewall on a transverse mounted engine, is bank number 1, so the forward sensor on that bank would be "bank 1, sensor 1." The driver's side bank(forward mount engine), or front bank(transverse engine) would be bank number 2, thus the forward sensor on that bank would be "bank 2, sensor 1," and the rearmost sensor on that bank would be "bank 2, sensor 2."

So it should the downstream sensor (after the cat) on the drivers side. If it is just one pipe, then it is just the downstream sensor. I'd replace it, then try clearing codes to see if the missfire one goes away. Good luck!
Rob D

[Big Willy]

No worries about the timming all I have out here for the next 4 months is time, lol. Thank you very much for the info and hopefully Donna will have it into Andre soon enough. ;D