E39 M5 and E52 Z8 Discussion
Hey Guys,
I popped a Code and it came up as:
Code 25: Pre-Cat 02 Sensor Heater Control Cyl #1-4
I searched through the Peak code knowledgebase and the DIY and it lead me to check the wiring in the DME and at the link between the sensor and the plug/connection. The connections look fine to me...