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What do codes P2238 & P2241 mean for a 2004 Toyota 4Runner SR5 V6?

I have a 2004 Toyota 4Runner SR5 V6 and the check engine light and both VCS track lights are on and stay on while driving. What does these codes (P2238 & P2241) mean, why are the lights that I mentioned stay on and how can I resolve these issues? I have researched and questions, yet I get a bunch of different answers that are confusing. Is there a difference between the O2 sensors & Air Flow Ration Sensors? The vehicle is due to go through emissions in a few months and I would like to have these issues resolve before then.
Vehicle: 2004, Toyota, 4Runner SR5, V6 4.OL
asked May 2, 2016 by Mike

1 Answer

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.
answered May 5, 2016 by Reynaldo (10,835 points)

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