O2 Sensor Problem. Please Help!
 

Hi, new to Club Lexus because this forum helped a lot when i first purchased my IS. But now to my problem. I have a 2005 Lexus is300, I had the motor swapped with same 2jzge-vvti motor and was able to use same harness and ecu. Anyways, i replaced all 4 of my o2 sensors based off the codes it was giving me which are P0156, P0133, P0153, P0130, P0150. Once i had all replaced i had the codes cleared and within 30 minutes of driving the CEL was back with same codes. Currently trying to get a hold of a voltmeter to check for faulty connector. Any have similar issue? my emissions are due soon so in a rush. Lost right now with this so any tips are appreciated. Thank you in advanced.

Exhaust leaks? Intake/vacuum leaks? The codes aren't good at telling you what is actually the problem. Replacing those sensors is very expensive and usually not the problem. I haven't seen fouled o2 sensors very many times in my life and usually the codes saying they're having problems are an indication of something else. I would check for vacuum leaks and exhaust leaks. You just swapped an entire motor in your car and unless you're extremely experienced with both doing that job and with doing that job on this car in particular then there's a high likelyhood that you may have missed something or damaged something during the install.