FIXED 08 535i - 9C55 code - fog sensor fail

[TheFixer]

I have a bad fog sensor. Causing hot air to blow through defroster when ac is blowing cold through vents.

Is it incorporated with the rain sensor or separate? Went to bmw parts and they can't find a 'fog' sensor.

Thanks for the help.

 

[NoQuarter]

I think they are the same thing.

 

[TheFixer]

I think they are the same thing.

Probably. Google searches I'm doing lean that way.

It's confusing because the fault says 'ifogger' sensor. Not rain sensor. If they are one in the same it's odd too as the rain sensor works fine for the auto wipers.

If it didn't cause the hot air issue I wouldn't care to replace it at all.

 

[TheFixer]

Ok.... it's called the condensation sensor and it's separate from the rain sensor.

Ordered a new one from fcpeuro.com Only 146 dollars....ugh. At least it's lifetime from them.

All good.

 

[NoQuarter]

Nice. So it installs in the same space as the rain sensor area?

 

[TheFixer]

Nice. So it installs in the same space as the rain sensor area?

Just underneath it. You can actually see the condensation sensor from outside the widow. The rain sensor is a rectangular box thing hidden above it. All tucked away in that plastic housing around the rear view mirror.

 

[TheFixer]

FYI. The condensation sensor is the bottom sensor. I'm glad there's a mounting clip on my windshield for it. From what I saw most are stick on.

Also, this did fix the hot air blowing from the defroster and footwells while the ac was blowing cold through the main vents.

Blows cold everywhere again.

 

[kd7iwp]

FYI. The condensation sensor is the bottom sensor. I'm glad there's a mounting clip on my windshield for it. From what I saw most are stick on.

Also, this did fix the hot air blowing from the defroster and footwells while the ac was blowing cold through the main vents.

Blows cold everywhere again.

I'm happy to hear someone else chime in that they have the clip-on sensor as well. RealOEM shows me that I should have a bonded sensor for my 2009 535 touring but mine has a clip. I've got the same error so will pick up this sensor.