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thstone · 12-23-2013, 02:36 PM

Yes, the "new" ECU is not being recognized by the immobilizer. The ECU, immobilizer, and the key fob must all be replaced/swapped as a matched set (or you need access to a PIWIS to reprogram them to match).

This typically means that you'll also have to swap the key shaft from your existing key fob to the new key fob so the new key fob can mechanically turn the ignition switch.

12-23-2013, 02:36 PM	#2
thstone Certified Boxster Addict Join Date: Nov 2010 Location: Los Angeles Posts: 7,669	Yes, the "new" ECU is not being recognized by the immobilizer. The ECU, immobilizer, and the key fob must all be replaced/swapped as a matched set (or you need access to a PIWIS to reprogram them to match). This typically means that you'll also have to swap the key shaft from your existing key fob to the new key fob so the new key fob can mechanically turn the ignition switch. __________________ 1999 996 C2 - sold - bought back - sold for more 1997 Spec Boxster BSR #254 1979 911 SC POC Licensed DE/TT Instructor Last edited by thstone; 12-23-2013 at 02:42 PM.