Code p0155 - 2002 Toyota Highlander

Check behind catalityc counter.

You made the classic DIY mistake--replacing whatever part is listed in the trouble code without doing any diagnostic work. P0155 relates the o2 sensor HEATER circuit. That can be caused by an open wire or a blown fuse. Until you fix that, the oxygen sensors won't work properly and that can cause a P0432. First fix the P0155 issue

Then fix the P0455 Evaporative Emission Control System Leak Detected (gross leak) issue. THEN see if the P0432 goes away.

P0155 is not telling you which part is defective, it is saying there is a problem in the system and that the triggers the fault code. In this case you have a O2 sensor whose heater is not heating. This may be the senor or the wiring to it.
P0155 OBD-II Trouble Code: 02 Sensor Heater Circuit Malfunction in cylinder Bank 2 (V6 only), Sensor 1, this is the sensor before the catalyst.

those would b your o2 sensors.front first.

this is front o2 sensor that is probably taking too long to heat up try a fuel additive that works on the catalytic converter as well as engine may just be a carbon build up if still causing a problem after thet renew sensor

For the P0155 code, check the fuse for the O2 heater circuit.
The P1494 has to do with the EVAP leak detection pump pressure switch. Or the switch is faulty, or there is a large leak. Do you hear any hissing sounds under the jeep?

P0155 CHEVROLET - HO2S Heater Performance Bank 2 Sensor 1

Replace the cylinder back sensor.

CODE P0155 IS O2 HEATER FAULT MOST LIKELY CAUSE IS WIRING, GROUND CONNECTIONS ,POSSIBLE ECM .

P0155 - Heated Oxygen Sensor Heater Circuit (bank 2, sensor 1)

bank 2 sensor 1 (front, driver side) o2 sensor needs to be replaced