Here are the VW alternator voltage regulators that I believe will work for S4
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VW Passat (98-05 2.8 V6 w/120A alternators)
Bosch alternator:078903016F (Part number 078903016F was superseded by part number 078903016H) $624.29
Valeo alternator:078903016H
Bosch regulator: 078903803E (Part number 078903803E was superseded by part number 038903803EX.) $60.77/ea
Valeo regulator: 06B903803 (Part number 06B903803 was superseded by part number 038903803K) $74.72/ea
Click the link and "Search by Factory Part Number"
Of course, I can't guarantee they'll work until someone tries one.
<ul><li><a href="https://www.1stvwparts.com/partscat.html">https://www.1stvwparts.com/partscat.html</a></li></ul>
Bosch alternator:078903016F (Part number 078903016F was superseded by part number 078903016H) $624.29
Valeo alternator:078903016H
Bosch regulator: 078903803E (Part number 078903803E was superseded by part number 038903803EX.) $60.77/ea
Valeo regulator: 06B903803 (Part number 06B903803 was superseded by part number 038903803K) $74.72/ea
Click the link and "Search by Factory Part Number"
Of course, I can't guarantee they'll work until someone tries one.
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038903803ex, 038903803k, 06b903803, 078903016f, 95, a3, alternator, audi, mk1, passat, regulator, test, valeo, voltage, vw