The pumps are fairly robust (mine is 17 years and still going) so I
would suggest picking one up at the junk yard. They used the same pump
in several VW and Audi models for a number of years, so don't limit your
search to '98 A4.
On your 98 A4 1.8T:
Central locking / Alarm system / interior light delay control module (V94)
in luggage compartment, right rear, behind trim
per Bently publishers
'98.5 A4 1.8TQ 5spd (APR)
''91 100q 5spd
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