BRKracing

Hey guys the increased emissions light came on my 04 530i I took it to two dealers one being my local mini dealer (because they took all the BMW techs from the local dealer) and the second dealer being BMW itself. Mini had diagnosed the problem and told me it was my thermostat was bad. When I took it to BMW they said it was my DISA valve have any of you had this issue? Thanks

BimmerFan52

Thermostat can cause emissions light if it is stuck open (engine won't warm up fast enough) or if the heater coil is broken (ECU tests the heater coil circuit on start up). I had a heater coil fail, and you can measure the resistance of the heater coil to eliminate that as a possibility. Pull the connector off the thermostat and measure the resistance between the two contacts - normally measures around 16ohms, but if it measures 1 (open circuit) then it is gone. A broken wire in the harness leading to the thermostat will also cause the same fault but it is rare.

Gangplank

Did you get a print out of the fault codes or read them w/ the BMWhat or Torque app?

BRKracing

hmm Ill check that thanks man! I pulled out my disa valve and the valve was just destroyed. so that will be getting replaced this week

BRKracing

No I didn't I blanked on getting them Ill ask the dealer and get a print out today

lazye60

Is your E60 6 speed manual? If it is, you might want to check your clutch. I had the same problem with my E60. I kept driving it and my gears wouldn't catch up to its speed like it normally would. But I changed the clutch and the Increased Emissions warning light is gone and my E60 is good as new.
-Josh

vkhong

Inspect your fuel filler cap as well. Clean the cap thread and seal, especially if it is dirty. You could use a little amount of fuel on a clean rag to wipe.