Hello Gentleman,

Recently MY 06 s2k has started suffering from the "lunging" issue at low RPMS and the CEL light that gives the code P2138. After searching the forum i understand that the issue is a result of the APP sensor or the TPS sensor. Here is where I have the confusion. I have an 06 which is the first year they did drive by wire and I am trying to figure out where the APP sensor is located? I see people mentioning that they replaced the APP and it solved the issue but I do not see anything saying where the APP is located. Are the APP and TPS sensors the same thing? I don't think so but I am having trouble finding anything on it.

Thanks a bunch for your time and help.