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Razor1973
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I hope it's OK to ask this in this forum. I also searched and couldn't find an answer to this or even someone having a similar issue. I recently changed the lithium battery on my 2019 Cayenne for an AGM one and I now need to register it so that I can get rid of the battery warning every time I start the car as well as the start/stop warning every time I stop while driving. I first tried with my Foxwell NT530 and, even though I was able to get rid of all other codes, I couldn't get rid of the battery-related ones. The tool even has a screen where I can set the new parameters: Capacity: 90 mA, instead of the original 60 mA Technology: AGM, instead of the original Lithium Manufacturer: VAR (code for Varta batteries, even though the new battery is an EverStart Platinum from Walmart), instead of the original LG6 (for LG Chem) Serial Number: 1234567890, instead of the original 10-char number However, once I enter them and hit Save, I get an error saying something like "error writing codes" without more details. My next attempt was PIWIS III on a laptop. I am using a virtual machine image with version 41.500 of the tool. I am able to detect and connect to the car just fine, even clear faults, but again, none of the screens that I found that let me change these 4 parameters (through Diagnostics > Gateway and several other menus that read "Battery" or "Batterie" in German) and they all give me a similar error. I can provide screenshots of that helps in case someone is able to assist me. Am I out of luck trying to do this on my own, meaning I will need to take it into a local shop? Which, by the way, I also attempted and two shops I talked to swore that they had a PIWIS and had me come in only because they were sure their Autel would do this, only to give up and give me my the car back, defeated. Thank you in advance! UPDATE: Everything I've read and experienced seems to indicate this needs hardware for the 9YA and software isn't enough, something like this conversion kit. In fact, I called a local shop that's supposed to be one of the best Porsche shops around and they confirmed this. Not this specific kit (I didn't ask), just that you need "a cable." UPDATE # 2: I just found this rennlist post searching by the website in link above. More proof: https://rennlist.com/forums/cayenne-...on-to-agm.html