po133 is bank 1 sensor 1 slow responce. po135 is heater circuit on bank 1 sensor 1. if you changed it and cose was erased and they both came back. po133 if you have a mass airflow problem or a leak on intake or exhaust leak on that side or wiring. (drivers side) for po135 that can be bad connection or wiring problem. check to make sure when you plugged it in that on other side prongs in connector didnt come out.
I can tell you one thing on those 3800 motors, unplug the MAF and if the car runs better thats your problem. Can not tell you how many times at the dealer that techs were pulling their hair out. That was the first thing i learned when i went to the dealer. (3800)check the maf on a rough running motor even with that o2 code.
Should be no reason to pull the plug on the mass air flow sensor. If you already have the scan tool hooked up the readings from the maf should show up in the data stream. Really the unplugging of the mass airflow is not a good test because depending on the vehicle you can force the pcm to run in default covering up you actual problem. Knowing how to properly diagnose components correctly the first time can save alot of headaches down the road.
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