OBD-II Diagnostic Trouble Code
P0040
O2 Sensor Signals Swapped Bank 1 Sensor 1 / Bank 2 Sensor 1
P
Powertrain
engine / trans
engine / trans
0
Generic
SAE standard
SAE standard
0
Fuel & air / aux emission
40
O2 Sensor Signals Swapped Bank 1 Sensor 1 /…
Severity · general guide
Moderate
Fix soon — usually won't strand you
Code type
Generic
System
Powertrain