So i purchased an american spec mini while here in germany. Shortly after buying the car i started to do some aftermarket work to it. First thing i did to it was a NM cold air intake. Then shortly after installing it, the engine light came on, i assumed it was an emission code but after i scanned it, the code that came up was P1028; engine running too cold.so i took it to the dealership and they replaced the thermostat housing. It happened again and they replaced the thermostat housing again, now the light is back on it and saying the same code. Engine too cold. Any ideas? or thoughts on what the hell is causing this and more importantly is this a major issue that can cause damage?

 

Greetings from Oakland Township!

Take the intake off and see if it does the same thing.

 

+1. Though when will BMW learn that plastic thermostat housing are complete crap and that they need to go aluminum? My 93 5 series had plastic and that think went like 3 days after I bought it.

 

hello to a fellow michigander! thank you, ill try it. But what doe the intake have to do with the engine being too cold?

 

While it COULD be the housing again, I'd have a close look at the harnesses...

Go on the hunt for chafed wires, damaged or contaminated connectors, pulled or bent pins.

Check closely around the cold air intake, as that area was disturbed prior the fault appearing.

Good luck!
E

 

Okay great, i didn't think of that. ill get right it! Thanks Summons

 

At least Mini got it half right with the new aluminum main water pumps, I guess they didn't get the memo for the thermostat housing even when last summer people were without their Mini's for 3-4 months because of stock issues.

 

Another question here is when the engine is at operating temperature, and you clear the code, does it come back?

 

Our mini had some corrosion in the wiring harness around the thermostat. The dealer replaced the thermostat and a chunk of the wiring under warranty.