So I found this online:
P1131 Lack Of HO2S1 Switches, Lean (Bank 1, Sensor 1)
P1137 Lack Of HO2S1 Switches, Lean (Bank 1, Sensor 2)
These codes usually do not indicate a problem with the O2 sensor. Rather, the O2 sensor is correcting rich due to an overly lean air/fuel ratio. Check Base Engine Idle, EGR, Fuel System and Air Induction System.
Bank 1 refers to the bank of cylinders containing Cylinder #1.
Sensor 1 refers to the O2 sensor closest to the exhaust manifold.
Sensor 2 refers the O2 sensor downstream of the catalytic converter.
So what should I do if thats saying it doesn't mean the O2 sensor has gone bad? I have a filter, but the MAF is stock. I do have a different tube connecting the MAF to the TB though. Could that be it? Or just the filter? Should I just get a chip or Apexi SAFC? haha
