My 00 mountaineer v8 was all wheel drive now 4406. But I just got a check engine light, and I ran the codes and I got p0401, p0602,p1729, and a p1000. The code that has me stumped is the p1729, its for a 4x4 low switch. My mountaineer was all wheel drive so how can I get a 4x4 low code? Whats...