P0135... The next thing I have to tackle...

[Joejeeper420]

The code is P0135 O2 1/1 Heater Circuit Malfunction... I know I should check voltages and such, but I think I'm going to just replace the sensor and see if that clears it first. This is the original o2 sensor that came in the jeep back in 2001... My question is... Is this the type of part that you have to change in pairs? Maybe even all at once? LoL.. I'm down to change the one but I'm hoping I don't have to change all of em...

 

[tjkj2002]

If one failed the others may not be far behind,best to replace all 4.Use only NTK sensors and they are not that expensive.