1.Well, the first thing that I did was to verify that the input and output sensors were reading properly. 2.I started with a volumetric efficiency test to make sure the MAF was calibrated properly, and I got 101% as a result, so I moved on to the air/fuelratio sensor. 3.This one...
To do the work my mechanic had to temporary remove the O2 sensor. When he put it back, that triggered the check engine light. To solve that, he installed a new one that I bought from Amazon. At that point the car was running fine, with no more check engine light. This repair may ...
The S2 sensor is a "narrow band" Oxygen (O2) sensor. The sensing cell produces a voltage, near 1.0V at or below AFR of 14.6:1 (rich), near 0.0V at or below AFR of 14.8:1 (lean). AFAIK, the Prius only uses the S2 O2 for monitoring catalyst function - some other cars use it...