diamondmine Posted August 30, 2017 Share Posted August 30, 2017 Hi, I'm hoping you can help. I have recently retrofitted Xenon lights to my A4. Had to replace J519 control module and have component protection removed. Since doing this I have no air con. VCDS shows HVAC 00898 implausible signal error which comes straight back after deleting. Have replaced sensor (just in case) and power to sensor ok but no signal/power to a/c compressor after checking. Could there be a fault with J519 although purchased new? Everything else works ok. Many Thanks Quote Link to comment Share on other sites More sharing options...
Steve Q Posted September 13, 2017 Share Posted September 13, 2017 Hey Craig welcome to the forum :) if you have relied out every other option then I would say the module could be faulty or something has been wired or fitted incorrectly. Sorry I can't help more. Cheers steve Quote Link to comment Share on other sites More sharing options...
niedzial1983 Posted September 13, 2017 Share Posted September 13, 2017 http://wiki.ross-tech.com/wiki/index.php/00898 Quote Link to comment Share on other sites More sharing options...
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