The vehicle’s PCM uses the multiple oxygen sensor readings to adjust how much fuel to inject into the engine for most efficient operation. The PCM monitors the engine sensor readings and if for example it puts more fuel into bank 2 of the engine but then sees that the bank 1 oxygen sensor is reacting instead of bank 2, that is the type of thing that triggers this code. For this DTC, the #2 O2 oxygen sensor will be downstream from (after) the catalytic converter. You may also experience the P0040 DTC at the same time.
This code is uncommon and only applies to vehicles with engines that have more than one bank of cylinders. Bank 1 is always the bank of the engine that contains cylinder #1.
Symptoms of a P0041 engine code may include: Malfunction indicator lamp (MIL) illuminated solid or flashing Decreased engine power or rough running/idle Increased fuel consumption