P2238 Oxygen sensor pumping current circuit low Bank 1 Sensor 1
P2241 Oxygen sensor pumping current circuit low Bank 2 Sensor 1
Even though these are Air Fuel ratio they are commonly referred to as Oxygen sensor, the difference oxygen sensor are narrow band, Air fuel ratio sensor are wide band, the difference between the two narrow band is slow moving and react slow to fuel control, while wide band are fast moving and react quicker to fuel control . Its all about fuel control. which is fuel management. in one word Fuel Economy. The first step when dealing with a P2238 and P2241 because these are both the upstream and are fuse protected check the fuse listed as A/F heater in the engine fuse / relay box, Most shop when they encounter both upstream A/F sensor or 02 sensor coding up at the same time would replace the relay listed as A/F heater relay located in the engine fuse / relay box.