P1117, P1121, Po131, Po151, Po137, Po157

[root_werks]

I added a ground strap last night from the tranny to the chassis. I didn't clear codes or test drive until I went to work this morning. I should have cleared the codes (duh). Not that I think I fixed anything, but with each change I should test to see if it's corrected my large swath of codes.

I did notice the car seems to be a little smoother now. Especially when it comes to very lightly on-off throttle. It's not "jerky" anymore. Not like it was, but it's smoother.

So the ground strap did good, just how much I still have to find out.

[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...