2003 MDX. I decided it would be a good idea to drive fast through a big puddle in the back of a parking lot. I am sure the exhaust didn't go under. That was a few days ago and the emissions and VTM4 dash lights are turning on. I reset the codes and they still come back on. The vehicle drives fine. I don't know if I need to dry out a wiring harness or just let it dry in general for a few more days.... I will go get the codes read tomorrow. Any idea where to start looking?
You likely fragged your oxygen sensors. You also likley got water in your differentials via the vents. An MDX is not a Jeep, deep water is not smart. Take it to a dealer, this could be expensive.
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