I usually hand wash the Disco at home, but I opened a new restaurant/bar recently and I'm spending all my time there these days so I ran old Indy through an automatic car wash. Upon exiting and accelerating into traffic, it was stumbling, misfiring, and seemed to be at around half power. After a mile or so everything returned to normal.

No dash light and Torque recorded no fault codes.

Is this a sign of a sensor going bad? I'd rather get ahead of this and correct it now to avoid being stranded on the roadside.

The crankshaft position sensor was replaced around a year ago. The o2 sensors are, I believe, the originals.

My daughter's 2016 Mazda CX-5 had a similar issue last year where the check engine light would illuminate only when we had rain or after snow melt. I replaced the o2 sensor (wires were frayed) and it's been perfect ever since.

 

An automatic car wash will fire hose water all up int the engine area. For a 20+ year old DI, this is a bad idea. The pressure will easily loosen or disconnect altogether a wire, etc. Most of the rubber gaskets, seals are cracked or rotted and cannot keep water out, causing a short or malfunction. I would avoid car washes.

 

Probably got a spark plug boot with cracks and it got wet and caused the rough running until it dried out. Check the wires and you can get some new ones and call it good.