I have a 2005 nissan maxima sl. I was leaving work and decided to take a dirt road that had sand. I went through a patch of sand and my car went into limp mode. The TCS OFF, SLIP AND SERVICE ENGINE SOON LIGHTS CAME ON and my car went into limp mode and only gets upto 20 To 35 mph. I have replaced 2 camshaft sensors, app sensor, throttle position sensor and mass air flow sensor. Still throwing a po643 code and won't reset.