OK, this is my first post here, I am just running into an issue where my Jeep is not running the same and has an engine light.

About a month ago while idling, my car stared running a little jumpy and puttering. Never happened before, turned the car off and then back on and it seemed to be fine for a little, but every once in a while, when idling it would do that again, and if idling for too long, I would struggle with accelerating until it all of a sudden "kicked in" and then was running fine again.

Next Day I see a check engine light now, so I go to AutoZone and I get multiple codes back:

• P0155 - O2 Heater Circuit (Bank 2, Sensor 1)
• P0135 - O2 Heater Circuit (Bank 1, Sensor 1)
• P0161 - O2 Heater Circuit (Bank 2, Sensor 2)
• P0138 - O2 Circuit High Voltage (Bank 1, Sensor 2)
• P1195 - Catalyst Monitor O2 Sensor 1/1 Slow Response
• P1196 - Catalyst Monitor O2 Sensor 2/1 Slow Response

So I feel to have 3 Sensors go bad at the same time is highly unlikely. I am unsure where to start with this as I cannot really find any posts about it being that there are so many codes.

I have checked the fuses and relays and they all seem fine.

I am unsure if the problem I described in the beginning of the post is even related to these O2 codes, but wanted to add it just incase and it did happen at the same time. I was told that maybe replacing the IAC might help with the choppy running idling.

Hoping to find some help here. Thanks in advance.

 

Start by looking at the wiring harness for the 02 sensors to see if they are melted or shorted. Then clean the IAC and throttle body.

 

O2 sensor wiring, spark plugs, and fuel injectors. Any of these can cause one or more cylinders to misfire. Because the oxygen in that cylinder isn’t burned up, the extra oxygen in that cylinder winds up passing over the O2 sensor. This makes the computer think it’s not injecting enough fuel. Similarly, a clogged injector may deliver too little fuel with the same results.

The IAC controls your idle air-flow. This definitely needs to be scrutinized for proper functioning. The IAC and throttle body go hand in hand, and require being cleaned up sometimes in order to help out with an abnormal idle.

O2 sensors codes almost always indicate a problem elsewhere. Usually, it is not the O2 sensors themselves.

 

When you have oxygen sensor heater circuit faults I would suspect a failed oxygen sensor almost all the time, However with three heater circuit faults I would suspect a blown fuse, failed ground, or melted wiring. Get under the car and start tracing wires back make sure you dont see anything else. next step would be to pull out the service manual/wiring diagram and figure out where they all ground out. Faulty oxygen sensor readings could cause random hiccups in the running like you are experiencing.

 

Just bought a new IAC and TPS and while installing will clean the Throttle Body. Will keep you updated.

Any specifics on this, I was advised about checking the grounds but don't have the manual and even if I did, not sure where to start.