Bypass pipes installed! Now a problem?

[AndyA6]

OK, scanned the car over lunch break at Autozone.

All 4 Oxygene sensors show a code...... cleared/erased. After 2 miles check engine light back on.

Hmmm, unusual to have all 4 sensors show a code?!?

Any ideas?

Thanks!

[DenverSteve]

It's interesting when these threads just stop. Did you find the problem? What was the fix? I'm going to change my exhaust also and agree that your exhaust change alone shouldn't cause the stated problem.

[jmatta]

I deleted the secondary cats years ago and have never had a CEL...something else is the problem.

I know this is an old thread, but perhaps the info will help someone else.

[paulv]

Originally Posted by DenverSteve

It's interesting when these threads just stop. Did you find the problem? What was the fix? I'm going to change my exhaust also and agree that your exhaust change alone shouldn't cause the stated problem.

DS,

Agree, it would be nice when people find solutions to post the results so others can benefit.

Another pet peeve I have when people say that the DME set some codes and never state what the codes are. On AndyA6's last post, codes can be set for all O2 sensors depending on the problem and DME version although only one O2 sensor could be the problem.

Regards,
paul...

[AndyA6]

Originally Posted by paulv

DS,

Agree, it would be nice when people find solutions to post the results so others can benefit.

Another pet peeve I have when people say that the DME set some codes and never state what the codes are. On AndyA6's last post, codes can be set for all O2 sensors depending on the problem and DME version although only one O2 sensor could be the problem.

Regards,
paul...

Steve/Paul, I agree! Sorry it took me so long. First of all I finally bought a Durametric cable, an extra laptop and started scanning.

Here are the codes:-

P0036:
Porsche fault code 373 - Oxygen sensor heater behind cat. conv. bank 1
P0056:
Porsche fault code 374 - Oxygen sensor heater behind cat. conv. bank 2
P0141:
Porsche fault code 14 - Oxygen sensor heater behind cat. conv. bank 1
P0161:
Porsche fault code 4 - Oxygen sensor heater behind cat. conv. bank 2


After erasing the codes come back almost immediately.

One theory is that during the pipe install some wiring came loose? I believe that is almost impossible, I watched/helped to do the install.

I also had no chance to get under the car, I totally injured my back and could hardly wallk for the past 2 weeks....... just getting back onto my feet! That did not prevent me to install my 997 shifter, trust me, can be done sitting down

However, I just now scanned again, same codes, same CL coming back after a couple of miles.

Well, there you go!

Later,
Andy

[Paul]

Have you checked your fuses?

[AndyA6]

Originally Posted by Paul

Have you checked your fuses?

The fuses are ok. Are there any additional fuses besides the ones in the car I have to check?

TIA!

[insite]

i had this happen once. it was a single bad O2 sensor & it caused codes to trip for all 4......