End all question to Sensors & Cats!!!!

[porsche986spyder]

Originally Posted by tholyoak

In your illustration there is no o2 sensor post that cat on the later cars that can use those bypass pipes, as the cat is in the header, thus no wire to leave hanging.
Todd

Which illustration are you talking about? As you can see, there are several. Both diagrams weather they are for the 2.5 or the 2.7 & 3.2Ltr. clearly show 2 sets of O2 bung wholes post cats. Look at this diagram, there are 6 sensors being used for models 00-04.

[rule1]

I have a 2000 986 with maxspeed headers, 2 o2 sensors per header. There are no o2 sensors on the second set of cats. I know because I installed my headers and i'm getting ready to install 200 cell sport cats and there are no o2 sensors on these or the stock secondary cats.

[Tool Pants]

Todd has it right. The parts diagram is just going to confuse you.

A 1997-1999 2.5 is different than a 2000-2004 2.7/3.2. Then you have ROW cars which are different then our cars. The parts diagram jumbles everything together in one diagram.

This picture is a North American 2.7/3.2. There are 2 cats on each side, for a total of 4.

The first or starter cat is part of the exhaust header. There are 2 sensors on the first cat. There is another cat before the muffler but it has no sensors. This is for one side.

Then you repeat for the other side of the car.

[porsche986spyder]

I finally jacked my car up last night and crawled up under it. Sure enough, that diagram I had was all wrong for my year and model. Well, sort of. That image/diagram shows ALL YEARS/MAKES on one sheet. That why it's so confusing. My 01 only has the 4 sensors on the cats located in the headers just as you guys told me. Thanks again. Guess I just had to see it for myself to understand.

[dcporsche99]

Wow, I defintely like how your sensors are more accessible as compared to my '99...there's so much more room to work with.