A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
8E0 857 511 B+ (color code) which has an integral light sensor.
Technical Background
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Production Solution
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Service
Check for above DTC as follows:
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Connect VAS 5051/5052 diagnostic tool.
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From Start-up screen, select "Vehicle Self-Diagnosis".
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Select vehicle system "09 - electronic central electrics".
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Select diagnosis function "02 - Interrogate fault memory".
If DTC "P2104/29 - G399 - short to ground sporadic" is stored in memory:
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Replace interior rear view mirror (Part No. 8E0 857 511B*). See Repair Manual, Group 68, Interior Equipment, Interior rear view mirror,
removing (automatic day/night mirror, interior rear view mirror with compass).
*) Add color code: 4PK - Soul Black (A4, A4 Cabrio); E59- Light Platinum (A4); F77 - Light Aqua (A4); 1RS- Twist (A4).
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Erase DTC using "05 - Erase fault memory".
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Proceed to "Check Operation of Automatic Headlights".
If DTC P2104/29 - G399 short to ground sporadic is not stored in memory:
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Remove interior rear view mirror.
Check supplier Part No. -arrow-.
If supplier Part No. is 905-0617, 905-0702, 905-0704 or 905-0706.
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Replace interior rear view mirror.
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Proceed to "Check Operation of Automatic Headlights".
If supplier Part No. is 905-1028, 905-1029, 905-1030 or 905-1031:
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Further diagnosis of automatic headlight system is necessary. DO NOT complete this Technical Bulletin.