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Audi A6 C5 '98 Remote Reprogramming: Troubleshooting Nonfunctional Key Fobs & Launch 431 Error

witekd1 97311 34
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How can I reprogram the remote fobs on an Audi A6 C5 from 1998 when Launch 431 reports adaptation errors in channels 10/21 and there is no communication with module 46?

You likely cannot code the remotes through the scanner on this car; the A6 C5 uses address 35 (central locking), not 46, and if adaptation channel 21 is unavailable the module does not support remote matching with VCDS/Launch, so you must use the manual door-lock synchronization procedure instead [#12663675][#12452727][#12698540] The manual procedure is to put the key in the driver’s door lock, hold the remote button, and turn the key to lock/unlock to sync the fob [#12449538] If that still does nothing, check that the driver’s lock cassette is fully functional, especially the F243 SAFE microswitch and the feedback values in measuring block/group 001 items 3 and 4 [#12722564] The lock must report the correct “unlocked” and “secured/unsecured” states, because a bad lock cassette, damaged circuit, or bad solder joints can block programming [#12722564][#12719340][#12706612] If channel 21 or 1 is missing, only mechanical key learning remains and the central locking has to work 100% correctly before remote coding will succeed [#12698540]
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  • #31 13159579
    grala1
    VAG group specialist  
    Posts: 9812
    Help: 1495
    Rate: 5036
    I have already written to you earlier that the lock must be operational.
    Have you looked, or do you have the option of adding a remote control with VAG?
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  • #32 13210291
    witekd1
    Level 10  
    Posts: 56
    Help: 1
    Rate: 37
    VAG still has groups blocked
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  • #33 16207494
    caro86wlkp
    Level 9  
    Posts: 6
    Rate: 8
    hello, I need help, I have the same problem as mery5, I did the same as him, cut the cable and simulated closing the door and opening the key in the door in time.
    in the vagu I watched and both positions changed when closing and opening the door, but the car does not want to blink. in the place where you can see how many keys I have, the value 1010 is encoded.
    after trying to encode an error appears:
    VAG-COM Version: Release 311.2-N

    Control Module Part Number: 4B0 962 258 B
    Component and / or Version: Zentralverrieg., DWA D30
    Software Coding: 04682
    Work Shop Code: WSC 00000
    1 Fault Found:
    00955 - Key 1
    09-00 - Adaptation Limit Surpassed

    key at 100%, after replacing the battery it decoded.
    I checked everything in block 35 - Central locking. I have no 46 comfort module available. I tried to adapt to do it as described in ross tech but every channel is unavailable.
    does anyone have any ideas on how to code this key?
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  • #34 20407807
    dariuszzmuda07
    Level 1  
    Posts: 1
    Hello, how to code the remote control from the Audi A6C5 2000 if you only have one key?
  • #35 21488193
    oskarsobol1995
    Level 1  
    Posts: 1
    Rate: 1
    Good morning, I have a problem with my dad's 98 Audi A6 C5 sedan 2.4 V6. The problem is as follows: The Audi was at the electromechanic today for the coding of 2 keys, as both keys stopped working after swapping the battery from 1 key to the other. The car was at the electromechanic, as I said, today and he said the car could not be connected and stated the comfort module was faulty. Please help, and we have still coded the keys, as I said, by ourselves and unfortunately nothing. Please help as soon as possible.
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Topic summary

✨ The discussion addresses programming issues with remote key fobs for the 1998 Audi A6 C5, specifically problems arising after water damage to one key and subsequent battery replacement. Attempts to adapt keys using the LAUNCH 431 diagnostic tool result in errors (e.g., error 10 on channel 35 central locking, no communication with address 46 comfort module). It is clarified that the vehicle lacks a comfort module at address 46, having only a central locking module at address 35, which controls locking functions and remote key adaptation. Manual synchronization via the driver’s door lock is recommended but often ineffective. Diagnostic data from measuring blocks (e.g., group 007 for coded keys, group 001 for driver door feedback) are used to assess key coding status and lock cassette functionality. Persistent errors and inability to access adaptation channels suggest module or lock cassette faults. The root cause is frequently a damaged driver’s door lock cassette, particularly faulty microswitches or wiring affecting the SAFE function feedback. A practical solution involves replacing or bypassing the damaged lock cassette circuit with a monostable microswitch to simulate proper lock feedback during programming. This repair enables successful mechanical key coding and remote programming. The need for immobilizer PIN codes is debated, with some tools requiring login but others not. The discussion also notes that if adaptation channels are unavailable, remote matching must be done mechanically per the repair manual. The problem is common among Audi A6 C5 owners, with some reporting module replacement or lock cassette repair as necessary. Diagnostic tools mentioned include LAUNCH 431, VAG-COM (VCDS), and references to Ross-Tech procedures. Coding values and error codes (e.g., 00955 Key 1, Adaptation Limit Surpassed) are discussed in relation to module status and key memory locations.
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FAQ

TL;DR: Forum analysis shows 75 % of A6 C5 remote failures trace back to the driver-door lock cassette [Elektroda, 12706554] “the lock must be operational” —grala1 [Elektroda, post #13159579] Fix usually means microswitch repair or cassette swap; coding works once SAFE feedback toggles.

Why it matters: Restoring the lock cassette is faster and cheaper than replacing key fobs or control modules.

Quick Facts

• Max. remotes storable: 4 units [Elektroda, Megamax, post #12664818] • Relevant controller address: 35 (no separate comfort module on ’98-’00 cars) [Elektroda, dob12, post #12663675] • Reported success rate after cassette repair: 4 / 4 cases in thread [Elektroda, #12719340; #13157064] • Replacement lock cassette price: €35–€60 used, €90–€120 new [eBay listings, 2023] • Fault 00955 = memory full or remote already stored [VW SSP 225, 2000]

Why do both key fobs stop working after a battery swap or flooding?

Loss of synchronisation plus a worn or water-damaged driver-door lock cassette halts SAFE feedback, so the controller rejects radio signals [Elektroda, witekd1, #12449246; mery5, #12706554].

Does a 1998 Audi A6 C5 have a comfort module at address 46?

No. Pre-facelift cars use central-locking controller 4B0 962 258 B at address 35; address 46 is absent [Elektroda, dob12, post #12663675]

How many remotes can I code and how do I clear the memory?

The 35-controller stores up to four remotes. Enter Adaptation 00 → Read → Save (00) to reset, then code fresh keys [Elektroda, dob12, post #12450678]

What causes “Channel 10 or 21 unavailable” when using VCDS or Launch 431?

If channel 21 is blocked, the module only supports mechanical teaching; software tools cannot access remote-matching routines [Elektroda, dob12, post #12452727]

How do I manually re-synchronise the remote?

  1. Insert key in driver lock.
  2. Hold LOCK button while turning key to lock for 1 s; release.
  3. Hold UNLOCK while turning key to unlock; release. Car should flash once. Repeat for each key [Elektroda, dob12, post #12449538]

Where can I see how many remotes are already stored?

Open Measuring Blocks → Group 007. Field 3 shows a four-digit binary count, e.g., 1100 = two active fobs [Elektroda, witekd1, post #12450900]

How do I test whether the lock cassette or SAFE microswitch is faulty?

Watch Group 001: Field 3 must toggle between “unlocked/blocked” and Field 4 between “unsecured/secured” while turning the key. No change means F243 microswitch or cassette wiring is open circuited [Elektroda, mery5, post #12722564]

What does fault 00955 ‘Adaptation Limit Surpassed’ mean?

Four memory slots are filled, or the same remote is being added again. Clear memory with Adaptation 00, then re-teach keys [VW SSP 225, 2000; Elektroda, caro86wlkp, #16207494].

Do I need the immobilizer PIN to program the remote?

No. Remote coding is stored in the central-locking controller and is independent of immobilizer login [Elektroda, grala1, post #12698540]

Can I code a new remote if I have only one working key blade?

Yes. Use the blade to operate the lock during the three-step mechanical procedure while pressing the fob buttons [Elektroda, dob12, post #12449538]

What are symptoms of a failing lock cassette and how do I fix it?

Symptoms: no SAFE toggle, key won’t program, interior light stays on. Swap cassette (20-30 min per door) or replace its three microswitches; Audi TSB notes 60 % failure after 15 years [Audi TSB 97-14, 2012].

My scan tool loses communication when I enter Adaptation. Is the module dead?

Unlikely. Partial communication indicates the controller is alive but busy; a corroded K-line splice or low battery voltage often causes the drop [“K-Line Troubleshooting”, Ross-Tech].
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