2007 Ranger with ~60k miles
This weekend, a couple of things happened:
1) tons and tons of rain and and big puddle of water in the passenger footwell
2) Check-Engine-Light came on and my OBDII reader said:
i) P0430 Catalyst system efficiency below threshold (left cylinder bank)
ii) U1900 CAN communication bus fault
Is it likely that the U1900 is also causing the P0430? Should I be looking for a disconnected wire (or perhaps one chewed through by a rodent)? I haven't seen a rodent but I see what looked like four or five mouse poops under the air filter. Not sure how long they'd been there.
For the puddle, it doesn't look like the door seals are bad and the inside of the door seems dry so I think it's coming through the engine (via those grills by the windshield?) Any chance this could have shorted something out? I'm thinking it's unlikely but I don't like coincidences
It's been too wet to get a good look so I'm trying to narrow down my scope here