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Roger, BMW Master Tech
Category: BMW
Satisfied Customers: 3045
Experience:  10 yrs. experience as BMW Master Technician, shop foreman and dealer.
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I have a 1998 bmw 740il that the obd2 scan creator C310 it

Customer Question

I have a 1998 bmw 740il that the obd2 scan creator C310 it power up but when prompted to scan for codes it tries for a few seconds and the says unable to communicate make sure key on I checked the 20 pin cap is on and tight also checked the fuses in the trunk and under the hood
JA: Most vehicles have two fuse panels. Have you located both?
Customer: yes in the trunk and under the hood
JA: Are you fixing your 740il yourself? What have you tried so far?
Customer: yes I checked the fuses and made sure the 20 pin cap was installed under the hood
JA: Anything else you want the mechanic to know before I connect you?
Customer: that's it
Submitted: 1 month ago.
Category: BMW
Expert:  Steve replied 1 month ago.
Have you tried a second scan tool?
Customer: replied 1 month ago.
I took it to the emission placed and it failed to communicate with two test stands
Customer: replied 1 month ago.
Okay so what should I look for?