P1117, P1121, Po131, Po151, Po137, Po157

[paulv]

Dan,

Go to here for essential documentation:

http://www.digital-kaos.co.uk/forums/f104/porsche-poses-2-42-install-cd-46838/

I couldn't get the system to install, but once the zip archives are unzipped, you can save all the English (EN) pdf's that are OBD2 related which contain troubleshooting information for all the codes -- stop searching in the dark and wasting your time!!!

BTW, don't ever clean a MAF sensor with soap/water -- CRC makes a spray cleaner for MAFs.

Regards,

paul

[root_werks]

Very cool, thanks Paul.

I wound up replaced the MAF after my "cleaning" which truly was nothing more than water, and not much of that either.

It wasn't the MAF at all.

I'm still hopeful the codes aren't being caused by bad wiring or bad DME.

Since I can test the O2 I replaced, but none of the others, I did order up 3 more from GRP. They should be here by the weekend. I know, I know, shouldn't just throw parts at it. But I think it's a good set of variables to eliminate.

I'll keep the updates coming. - Dan

[paulv]

Originally Posted by root_werks

Very cool, thanks Paul.

I wound up replaced the MAF after my "cleaning" which truly was nothing more than water, and not much of that either.

It wasn't the MAF at all.

I'm still hopeful the codes aren't being caused by bad wiring or bad DME.

Since I can test the O2 I replaced, but none of the others, I did order up 3 more from GRP. They should be here by the weekend. I know, I know, shouldn't just throw parts at it. But I think it's a good set of variables to eliminate.

I'll keep the updates coming. - Dan

Bad/corroded wiring/connectors have their share of causing CELs to come on and should be inspected/tested with a good digital volt/amp/ohm meter (at least a 10 Mega ohm input impedance).

Regards,
paul...

[root_werks]

Replaced the other 3 O2's today. Noticed the Bosch have shorter wires and better connectors.

CEL was cleared and after 60 minutes of driving didn't come back on. Won't say that I solved the issues yet. But so far so good.

[root_werks]

CEL did come back on today, P0403, none of the original codes were present. Cleared just for giggles, took about an hour of driving and same P0403 code returned. I'll consider this issue closed now. Hopefully it'll make a good reference for someone else in the future.

On to the next code!

[paulv]

Originally Posted by root_werks

CEL did come back on today, P0403, none of the original codes were present. Cleared just for giggles, took about an hour of driving and same P0403 code returned. I'll consider this issue closed now. Hopefully it'll make a good reference for someone else in the future.

On to the next code!

The P0403 is a generic code for an EGR system, and I didn't know that these engines had an EGR valve. Maybe someone else knows.

Regards,
paul...

[root_werks]

With my Box having 103k on the clock and pretty much everything original, I plan to replace the following which will hopefully resolve the latest CEL:

993-113-250-03 - Crank case check-vent valve
996-113-245-01 - Change over vavle for air injection
993-113-245-01 - Cut off valve for air injection

All those will be around $200 and if they don't solve it:

996-605-201-01 - Purge vavle for fuel vapor canistor

And if I get desperate:

996-606-160-01 - Idle air control valve - like $300 or so.

The change over valve has an electrical connection on it, so I am hoping that is what is causing the CEL. We'll see. I'll post back results here.

Before I order anything though, I'm going to pull the lid this weekend and check hoses again, make sure things are clear and actually see if I have any of the above listed EGR related parts on my Box. It's a 97', so I can see Porsche using some 993 parts I guess?

Making progress!