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Q: code 100 on the trans
on 1995 BMW 540i

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i change all shift selenoid and still getting code 100
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is it p0100, you can look here,
http://chinasinoy.com/service/diagnostic-trouble-code-table-33.html
if it is this code, the solution may:
The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:

Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
Unplug and reconnect the MAF wiring harness
Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)
Replace the MAF sensor
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