[mirai777]

I have a 2019 440i GC. There was flash flooding yesterday, big puddle of water, didnt realize how tall it was, drove through it slowly and got drivetrain malfunction. Air intake was damp, wasn't soaked. Got it towed home, changed air filter, checked spark plugs and cranked engine. Spark plugs were good and no water came out. There was a lot of white smoke coming out car and rough start, checked codes and got misfire in cylinder 5 and 6 (P0035 and P0036), but also code P0055. "Ho25 Heater Resistance Bank 1 Sensor 3". Confused, isn't there only 2 sensors? I plan to do an oil change as well later today. Could there be more to it?

[Tommy D]

I'd dry the car out, water and electronics don't mix. You might have gotten water in the O2 sensor connections? Disconnect them and dry em out and add some dielectric grease before connecting. Where was the white smoke? Out of the engine bay or back of car at the exhaust?

[mirai777]

Originally Posted by Tommy D

I'd dry the car out, water and electronics don't mix. You might have gotten water in the O2 sensor connections? Disconnect them and dry em out and add some dielectric grease before connecting. Where was the white smoke? Out of the engine bay or back of car at the exhaust?

The back of the car, out of the exhaust