For anyone looking to replace their aging alarm sirens, according to the 7Zap parts website, the Mk2 TT uses PN 1K0 951 605 C for all production years (2007-2014). Thankfully these were all produced by Bosch so there's not a mix of suppliers. However, there's no point buying another C-revision as the NiMH batteries inside will be at least as old (and possibly just as defective) as the ones in your own alarm siren given they only have an 6-8 year* life expectancy.
VAG has since updated the alarm with D and E revisions with the current revision at F (as of Feb 2022). If you don't want to pay the current Audi price quoted me of € 201.91, you can look on reseller sites and check the dates of used alarms to figure out how old the batteries are inside the alarm, assuming the batteries were produced close to the production date of the alarm.
From the photos below taken from different alarms I found on eBay, you can see the part number printed across the top of these alarms. The F-number is probably the manufacturers part number since it's the same for all years. Across the bottom we find HW: (Hardware) and SW: (Software) and all the way to the right is a five digit code. As far as I can tell, this is the date code.
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In this example we have four different alarm date codes; 30421, 49127, 99107 and 79009. If we look these up on the Bosch Manufacturing Date Decoder from 1960-2020, and assuming the last two digits are the day of the month, we can determine the date the alarm siren was produced and the approximate age of NiHM batteries.
49127 = 27 November 2004
79009 = 09 October 2007
99107 = 07 November 2009
30421 = 21 April 2013
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For the latest version of the Bosch Manufacturing Date Decoder, click here.
* As published in the V150HT Data Sheet
VAG has since updated the alarm with D and E revisions with the current revision at F (as of Feb 2022). If you don't want to pay the current Audi price quoted me of € 201.91, you can look on reseller sites and check the dates of used alarms to figure out how old the batteries are inside the alarm, assuming the batteries were produced close to the production date of the alarm.
From the photos below taken from different alarms I found on eBay, you can see the part number printed across the top of these alarms. The F-number is probably the manufacturers part number since it's the same for all years. Across the bottom we find HW: (Hardware) and SW: (Software) and all the way to the right is a five digit code. As far as I can tell, this is the date code.
In this example we have four different alarm date codes; 30421, 49127, 99107 and 79009. If we look these up on the Bosch Manufacturing Date Decoder from 1960-2020, and assuming the last two digits are the day of the month, we can determine the date the alarm siren was produced and the approximate age of NiHM batteries.
49127 = 27 November 2004
79009 = 09 October 2007
99107 = 07 November 2009
30421 = 21 April 2013
For the latest version of the Bosch Manufacturing Date Decoder, click here.
* As published in the V150HT Data Sheet
