Taking a flyer here as the mazda forums are dead. I have an 07 Mazda 6 with a 4 cyl 2.3 liter.
It appears to have 2 upstream O2 sensors and 1 downstream. Some online folks confirm this is true for a CA emission system.
However, the shop manual only says there are PIDs for 2. This is confirmed by my scan tool.
Voltage data is all over the place - it is possible that 2 sensors report on one PID? Or is my scan tool not seeing all 3 for some reason?
It appears to have 2 upstream O2 sensors and 1 downstream. Some online folks confirm this is true for a CA emission system.
However, the shop manual only says there are PIDs for 2. This is confirmed by my scan tool.
Voltage data is all over the place - it is possible that 2 sensors report on one PID? Or is my scan tool not seeing all 3 for some reason?