986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Possible solution for CEL when using headers on 2000+, an O2 spacer with a mini-cat..

Smallblock454 · 02-12-2017, 05:03 PM

EU 986 cars only have 2 catalytic converters. The headers are straight. They don't have a SAI. One idea might be to flash the ECU with a EU/ROW file. But that won't work with no cats. The ECU gets lambda signals from before and after the cats. So 2 cats and 4 lambdas.

Maybe someone can reprogram the ECU so it does work without cats. But you'll need at least 2 lambdas to run the engine management correctly. And the adaption has to be done to each engine / ECU software version specific.

Optional it might be possible to manipulate 2 of 4 lambda inputs.

Lambdas seam not to be can bus controlled, which makes it simpler.

Regards, Markus

02-12-2017, 05:03 PM	#7
Smallblock454 Registered User Join Date: Jun 2014 Location: LB, Germany Posts: 1,456	EU 986 cars only have 2 catalytic converters. The headers are straight. They don't have a SAI. One idea might be to flash the ECU with a EU/ROW file. But that won't work with no cats. The ECU gets lambda signals from before and after the cats. So 2 cats and 4 lambdas. Maybe someone can reprogram the ECU so it does work without cats. But you'll need at least 2 lambdas to run the engine management correctly. And the adaption has to be done to each engine / ECU software version specific. Optional it might be possible to manipulate 2 of 4 lambda inputs. Lambdas seam not to be can bus controlled, which makes it simpler. Regards, Markus __________________ My Porsche keyfob, instrument cluster and alarm ecu repair service: https://sportwagendoktor.de Last edited by Smallblock454; 02-12-2017 at 05:13 PM.