Lou, down where the ecu lives there should be a plastic cover with a few fuses clipped into it. These will either be the metal thermal fuse or regular plastic/metal fuses. The metal thermal ones don't blow but open and close. So they could cut power, cool down, then reset back to power. A normal fuse would just blow and you would need to replace it. I have checked and it seems that thermal fuses are listed in those positions. So you will need to check them physically. The p/n is 443 937 105B.
If you have them, just replace them with normal fuses of the same rating to see whether that is the issue.
I thought that they may have been phased out when the S6 was introduced but there is no chassis break information to confirm that.
My previous suggestion about checking the power at the injectors is complicated by the holding relay in the ecu. So you would need to check whether there is power at the injectors when cranking as thats when the ecu triggers the fuel pump relay.
If you have them, just replace them with normal fuses of the same rating to see whether that is the issue.
I thought that they may have been phased out when the S6 was introduced but there is no chassis break information to confirm that.
My previous suggestion about checking the power at the injectors is complicated by the holding relay in the ecu. So you would need to check whether there is power at the injectors when cranking as thats when the ecu triggers the fuel pump relay.
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