Porsche 911 Carrera 4S Targa

Renntech · 19 Aug 2026

Hi everyone, I’m working on a 1996 Porsche 911 (993) Turbo, and I’m currently having a problem with the factory alarm/immobilizer system. The car had been exposed to water, and several electrical control modules/PCBs were affected by water intrusion. I have already removed, cleaned, and dried the affected circuit boards, and there are no obvious signs of corrosion remaining. However, I still cannot get the immobilizer/alarm system to pass its normal initialization. Current symptoms: As soon as I turn the ignition/power on, the horn starts sounding continuously. The lights keep flashing contin…