Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Hi , i'm looking at a 2008 Mazda three with a 2.0 L. My scanner can read live data. The car was already warmed up when I saw it and it was already in closed loop. My question is how come I cannot see the upstream sensor on my scanner? I can only see sense or two after the cat. Thanks for your response.
This car most likely does not have a PID for Ho2s B1S1 because, like most cars today, it likely uses a wide range air fuel ratio sensor in front of the cat.
The PID may be AFSens1, or something similar to that, and may be displayed is volts or amps.
I'm not super familiar with Mazda nomenclature, so I'm not sure exactly how it will be labeled in the data stream.
