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PaleAle
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I just solved my 4 wheel error code. The problem started when the battery was nearing end of life. After replacing the battery we still had the issue. Next replaced the servo & then ECU to no avail. Next we upgraded the battery from Interstate to OEM but that didn't work. Porsche of Stevens Creek was of no help so I searched the web & found this at Pelican Parts and found a procedure to basically sync the system IT WORKED! Sorry, I cannot find the link but I did summarize it in a text. 1. Activate off-road /Low Range mode/ driving program (use rocker switch) with gear shift lever in neutral position 2. Drive your car for a while (move forward/backward several meters) 3. Activate on-road /High Range mode/ driving program (use rocker switch) with gear shift lever in neutral position It may "heal" your all-wheel drive system, e.g. resistor, which identifes mode in which system is and generates fault message when corroded - it happens when you do not use this feature for a long time... I did this and drove around the block. It's been a month and the error code has not returned. We bought the vehicle in 2017 and never once adjusted the range. I'd wager the first time it had ever been adjusted is when I followed the procedure.