P0139 intermittent/rough idle

[Jaybird91]

Hello , So i had an issue this week with the p0139. The stubborn 02 sensor was giving me problems. Scanned and reset twice. I drove on the fwy the second time with my scanner to make sure it wasn't pending. I then drove it to get smogged and it passed luckily. On top of that i have another question/theory.
Has anyone had this issue of rough idle and possibly misfire related code for some reason while using or powering there radio or headlights? i get a rough idle for a good moment while turning these electronics on when at a stop light in Drive.
04 V6 liberty - Thanks

 

[LibertyTC]

P0139 O2 Sensor 1/2 Slow Response, best to replace the 02 sensor with NTK sensor.
Jeep is very particular about charging & voltages. Have you had the battery load tested?
Using a VOM what is the battery output voltage while engine running?
Rough idle or misfire, Have you tried installing new spark plugs ? Use ONLY NGK ZFR6F-11G gap .040 inch.
Eventually it may set a code for the misfire, which would be helpful.
If the Jeep is high mileage replace the coil packs, as it is considered a tune up item. I used Standard Brand, but Mopar coil packs are best.

 

[Jhkj04]

Similar issue, rough idle and code said both rear 02’s. Replaced these and now no code but idles real rough in park and at a stop. Swapped the plugs to find some random brand and installed Ngk. It’s better but not right yet. Looking at the old plugs I’m guessing number 6 needs a coil pack? Also I swapped batteries and added an additional ground while checking the pcm ground and engine block grounds that all seam clean and good. Any thoughts or ideas would be appreciated.

 

[sleazy rider]

If you’re changing a coil, do them all.