Sitting around 118k miles right now and got shot the p3400 code. I put in a new oil switch on that side and it hasnt given me a code since. Then after about a month it gave me a code on the other side p3497 tried the same thing getting the same part from the shop. But this time it still brings up that code only for the p3497 side and im not sure why. Code doesnt flash instantly and takes about an hour to turn back. Does anyone know why its still giving me that code.

 

Scrape the corrosion off of the terminals in the plug in