I have a fault code 2ef4

SK525XI

MEMBER
2006 BMW 525XI
10,000 MILES

My service engine light on my 2006 525xi popped up on the dashboard. I brought my car to the BMW dealer service dept. They told me my thermostat and housing needed to be replaced. I am not real confident in them so I brought my car to a BMW certified garage. They told me that I had a fault code 2ef4, and that a technical service bulletin states that the radiator needs to be replaced and that the software needs to be upgraded. They don't know why the dealer told me that the thermostat and housing needed to be replaced. Not sure what to do.

1 Reply

BMRFIXIT

MECHANIC
19,053 POSTS

2EF4 faulty thermostat the correct way is to have the thermostat and housing replaced. Here is a guide to help walk you through the repair.

https://www.2carpros.com/articles/replace-thermostat

Please let us know if you need anything else to get the problem fixed.