Quote:
Originally Posted by ard
Look at the schematics for the O2 sensor...the preheater circuit may be supplied by a fuse under the DME. if the fuse is blow, you get an immediate code. (other O2 sensor faults will take a while to collect the data that indicates a problem- not the preheat circuit)
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https://bmwteka.com/wds/en/e70/02a363d5
looks like the fuse is in the JBE.
Although......
When I installled the used VVT module, I made a mistake. I accidentally forgot to install the DME cover. It rained overnight and the DME box accumulated about a gallon of water in it. Luckily, I had pulled the battery the night before, in anticipation of digging into the JBE and FRM modules the next morning, but forgot to check the forecast. I removed the DME and VVT modules and opened them up, but luckily they had not taken in any water. I Used a long 1/8" drill bit and put a hole in the bottom of the DME box to get the water out. This is probably why I got the DME box fan code also, but I was unaware there was a fan in the box. I guess I'll have to get it out of there and see if I can resurect it or replace it if necessary, along with checking F43 in the JBE.
Additionally, I will check the DME connectors again, as I see the DME provides the path to ground for the heater circuit
https://bmwteka.com/wds/en/e70/2152dba4
03-27-2023, 03:34 PM
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