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Smallblock454 · 04-16-2022, 01:10 AM

For a 1999 engine you'll need a 7.0 DME.

A 1997 986 will have a 5.1 DME - not compatible, because it hasn't the correct in- and outputs. Also the engine wiring harness is different.

If you get an 7.0 DME from a 986 the mapping needs to be flashed for a 996 3.4 engine. This can't be done by OBD. This always needs to be done on the bench.

Check what alarm control module you have. If you have a M531, you'll need to update to an M535. If you have a M535 it can be reprogrammed to work with the newer DME.

If you need to update from M531 to M535 the wiring harness has to be updated too.

04-16-2022, 01:10 AM	#8
Smallblock454 Registered User Join Date: Jun 2014 Location: LB, Germany Posts: 1,514	For a 1999 engine you'll need a 7.0 DME. A 1997 986 will have a 5.1 DME - not compatible, because it hasn't the correct in- and outputs. Also the engine wiring harness is different. If you get an 7.0 DME from a 986 the mapping needs to be flashed for a 996 3.4 engine. This can't be done by OBD. This always needs to be done on the bench. Check what alarm control module you have. If you have a M531, you'll need to update to an M535. If you have a M535 it can be reprogrammed to work with the newer DME. If you need to update from M531 to M535 the wiring harness has to be updated too. __________________ My Porsche keyfob, instrument cluster and alarm ecu repair service: https://sportwagendoktor.de