Check engine light problems

[Mason Methot]

Gotten the codes today from the scan and they read:
P0138 Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2
P0152 Oxygen Sensor Circuit High Voltage Bank 2 Sensor 1
P0300B Random - Multiple Misfire Detected

Lovely, just lovely. :blah:

 

[HoosierJeeper]

I would start with the misfire. That's probably causing the O2 sensor codes. It would be unlikely that'd you'd have 2 O2 sensors fail at once, especially being opposites of each other.

How are your spark plugs and coil packs?

 

[CalcityRenegade]

+1 on the misfire. If the plugs have not been replaced in a while I would check them all and replace if needed. Also have the coil packs tested. I have had bad coil packs do everything from just throw a code to putting the Jeep into limp mode.

 

[HoosierJeeper]

Did the scanner tell you which cylinders are misfiring? To be sure it's coil packs, try switching with the "good" ones and see if the misfire follows the suspect coil packs.

 

[Mason Methot]

Did the scanner tell you which cylinders are misfiring? To be sure it's coil packs, try switching with the "good" ones and see if the misfire follows the suspect coil packs.

It just said Cylinder Misfire Detected and nothing else about it.

We also installed one of these a few months ago to help up with our towing, not sure if it is a culprit in this situation or not :/

https://www.amazon.ca/SKL-Motorwork...id=1473481425&sr=8-1&keywords=jeep+liberty+hp