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The wife's WJ (4.0L 2004) threw P0135 and P0155
P0135 (M) - O2 Sensor Heater Circuit (Bank 1 Sensor 1) - Oxygen sensor heater element malfunction.
P0155 (M) - O2 Sensor Heater Circuit (Bank 2 Sensor 1) - Oxygen sensor heater element malfunction.
The question I have is which sensors are these (the FSM calls them 1/1 1/2 2/1 2/2) and how do you replace the heater?
P0135 (M) - O2 Sensor Heater Circuit (Bank 1 Sensor 1) - Oxygen sensor heater element malfunction.
P0155 (M) - O2 Sensor Heater Circuit (Bank 2 Sensor 1) - Oxygen sensor heater element malfunction.
The question I have is which sensors are these (the FSM calls them 1/1 1/2 2/1 2/2) and how do you replace the heater?