2000 RX300 and long story short, I have been clearing a bunch of codes by replacing things like knock censor, MAF sensor, coils in order to be able to pass emissions test.
I have one code left, P0171. I know this is typically the MAF, but since I just put a new one in, I can only think of the O2 sensors that are left.
Of the Bank 1 sensors, is one more common to fail than the other? Is there any way to tell which one needs replacement? Or do I do whichever is easier and cross my fingers?
Thanks in advance.