I just got a code reader from Ebay and checked a CEL I had. The codes displayed were 4471 and 4438.

I looked up 4471 and it is "Bank 1, Probe 1, Internal resistance too great". I don't really know what that means. I was guessing maybe something to do with the oxygen sensor, but I can't find anything else on it.

I can't find 4438 anywhere. Can anyone help me out or point me in the direction I should be looking? I tried googling and searching the codes in forums and didn't come up with anything. Thanks in advance for helping!