Help fixing code issues, Please??

[RL139]

Hello All
I have a 2002 sport with the 4.0 Liter with the California emissions set up
I went to auto zone & got a loaner OBD2 scanner & i am pulling 6 codes
They are
P0161 02 sensor heater circuit malfunction bank 2 sensor 2
P0204 Injector Circuit, open cylinder 4
P0351 Coil A primary/secondary circuit malfunction
P0352 Coil B primary/secondary circuit malfunction
P0353 Coil C primary/secondary circuit malfunction
P0340 Camshaft sensor A bank 1 circuit malfunction

Now the question is how do i fix all this?
Thank you in advanced for any help

[fredjacksonsan]

You didn't say how many miles are on the Jeep, or if it's automatic or manual.

At 1st guess, I'd think it could be either the camshaft position sensor, or the crankshaft position sensor. The crank sensor can go at 90K miles, and if you have an automatic, then it can cause some odd shift patterns. Has the Jeep run rough, or cut out on you?

[hundahunta]

also check for battery acid on the pcm harness. and inspect the left rear cylinder head cover the stud rubs the wiring harness ...