1999 Audi S4
Low-Price Key Made at Your Location in Ventura County

1999 Audi S4 Remote flip key Replacement - Fast, Affordable & Professional

Your 1999 Audi S4 uses a remote flip key. On the smart key models, that means a fob housing with 4 buttons on the face, a CR2032 battery inside powering the wireless communication, and an emergency HU66 blade tucked inside for backup entry. The car detects this fob through proximity antennas in the doors and cabin. Without it, the engine will not start.

A graphic designer at her townhouse driveway in Oxnard near RiverPark neighborhood had a S4 with a cracked smart fob. The housing had split at the corner from being dropped on the garage floor and the emergency blade was rattling loose inside. The dealer told her the only option was a brand new fob, programmed from scratch. 462. What they did not mention was that the electronics inside her cracked fob were still working perfectly. The circuit board and antenna chip were fine. She just needed a new shell.

I used my ACDP to read the BCM2 immobilizer data as a backup before starting any work. The ACDP reads the encrypted security module data directly, which gives me a safety net in case anything unexpected happens during a shell swap or reprogram. I moved her working electronics into a fresh housing, replaced the weak CR2032 battery, and verified every button plus the comfort access and push-to-start. Her fob, FCC ID MYT8Z0837231, worked exactly like it did before the crack.

She paid 243 for the shell swap and battery. The dealer wanted 462 to replace the entire fob when only the plastic was broken.

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