So I got this interesting error message in my FF yesterday ... Catalytic converter temperature system failure: Catalysts temp. not plausible. Go to dealer slowly I drove the car to work in the morning, parked in the building basement (much cooler down there than outside), didn't move the car all day. Evening time, got in the car to go home and got this message as soon as I hit the engine start button. Didn't move the car, turned it off, waited for a few minutes, restarted the car and got the same message again. I thought it must be some sort of bug as there is no way the catalytic converters were too hot. The car was parked and hadn't moved for 6-7 hours. I drove it home slowly and this morning it started just fine with no error messages. Suggestions? Is it worth a trip to the dealer or just ignore it and hope it doesn't come back?