Morning all,

I'm having an issue with my e34 since last week. She kept cutting out as I was driving and eventually wouldn't re-start.
Checked for fuel and spark, had neither. Power-probed the fuel pump and still nothing, replaced the fuel pump and still no joy. Eventually got her plugged into diagnostics which gave me a "Key transponder 2" fault. So I thought since I was using the second key (no LED in the key) it was the key at fault. Dug out the first key with the LED, still no joy. She starts intermittently, but I can't trust she won't die randomly when I'm driving.

Does anybody know the fault finding procedure for immobilizer faults or had a similar issue or any idea on how much a new key runs for an e34?

Hoping someone can help

Kind regards
Helpless carless man