P0138 02 sensor?

jafstl38 · **Posted:** Fri Sep 03, 2010 10:16 am

I just threw a code for a bad 02 sensor, it says its bank 1 sensor 2. Isnt that right after the cat? It also says my engine will run choppy and idle funny and be very laggy until it is fixed. My KJ has been laggy for about 6 months, could this have been the problem all along and i'm just now getting a check engine on it?

jafstl38 · **Posted:** Mon Sep 06, 2010 6:09 pm

No one else has haD this issue!?

hardhittinz · **Joined:** Tue Jul 03, 2007 10:44 pm **Posts:** 195

mine threw same code and i crawled under to find the wire was chewed some how so i spliced it back together and drove like 20miles or so and light went out and jeep runs good now.

jafstl38 · **Posted:** Mon Sep 06, 2010 11:27 pm

Did you jeep run funny at all?

DirtyKK · **Posted:** Mon Sep 06, 2010 11:58 pm

[bank] suggest which side of the engine is on and the [sensor] is how they are numbered in line away from the motor. im pretty sure the 2nd o2 sensor only makes sure the catalytic converter is doing its job and wont affect the performance of the vehicle. the 1st on the other hand can determine if the motor is running rich/lean, which if goes out could cause drive-ability issues. on my old car i had a straight through exhaust and didnt even have the 2nd o2 sensor hooked up for the 4.5 years that i owned it.

jafstl38 · **Posted:** Tue Sep 07, 2010 2:38 pm

Hmmm ok, I have kind of a rough idle and was hoping thy might have been the cause

P0138 02 sensor?

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