Actually, he first told me that it sounds like a clogged/fried cat. He said that in certain instances, if the primary O2 sensor is faulty, it can cause the ECU to play with the mixture, which in turn could screw up the cat.

If the cat was clogged, then the turbo could not spin since there would be too much back pressure, causing my no-boost condition.

But, I told him I disconnected the "W" hose from the BPC, and drove VERY CAREFULLY to see if I had any boost, and sure enough, I had plenty! He then said in that case, my cat is more than likely okay since exhaust was making it through it.

He also told me that function if the 2nd O2 sensor is to maintain a "flat-line". It does NOT compare the exhaust mixture coming out of the cat to the readings of the first as it goes in. That's a big misconception. He said the 2nd sensor just looks for a constant reading, and feeds that back to the ECU. It does not make the ECU adjust anything; the 1st one does that. So even if I had a clogged cat, the 2nd sensor would still show a constant mixture (even though it's a bad one), and that would not trigger a fault code. So this nixes my idea that maybe the 2nd one is bad, and that I'm barking up the wrong tree.

Also, I noticed there is a fuse in the cabin fusepanel for the O2 sensor. It doesn't say which one. Why in the world is there a fuse for this sensor? That would indicate that before the wiring goes to the ECU, it DOES pass through the bulkhead since it feeds to the fuse panel. Does this spell out anymore testing I should be doing?

BTW: thanks for your clarification, Eric! I know now how to hook it all up. I don't blame him; he probably said exactly what you wrote. I may have had a brain-fart at the moment.

Anyone know the pin # at the ECU for the primary O2 sensor feed????!!!!

Joe


posted by 12.111.48...

• How to test O2 sensor with a AA-battery?, Joe98, Thu, 4 Sep 2003 07:53:38
  • Although this is lengthy, PLEASE read for info>>>, Joe98, Thu, 4 Sep 2003 14:21:07
    • Dirty, lying error codes., Ari , Fri, 5 Sep 2003 11:01:11
    • Re: Although this is lengthy, PLEASE read for info>>>, jim kane, Fri, 5 Sep 2003 10:54:05
    • Test w/ a NEW bpc solenoid!!, John Rose, Fri, 5 Sep 2003 05:41:22
      • John, please email me, Bill Homer , Fri, 5 Sep 2003 20:54:50
  • Re: Fuel pressure test???, Ola The Swede, Thu, 4 Sep 2003 12:36:14
  • Re: How to test O2 sensor with a AA-battery?, Eric Law, Thu, 4 Sep 2003 08:06:43
    • Very hard way to do a simple test, Ari , Thu, 4 Sep 2003 08:37:56
      • Re: 0.2 is lean, Karthik, Thu, 4 Sep 2003 13:58:16
        • Yup., Ari , Fri, 5 Sep 2003 10:48:44
      • Ari, my sensor is brand new..., Joe98, Thu, 4 Sep 2003 08:50:30
        • No boost, and Not enough boost., Ari , Thu, 4 Sep 2003 11:43:39
        • Fourth wire is for OBDII cars (like yours)..., Street, Thu, 4 Sep 2003 10:45:00
    • Re: How to test O2 sensor with a AA-battery?, Joe98, Thu, 4 Sep 2003 08:19:07 <-- Viewing This Message
      • The O2 sensor fuse is for the pre-heater..., Street, Thu, 4 Sep 2003 11:06:33

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

• Prev by Date: Re: How to test O2 sensor with a AA-battery?, Eric Law, Thu, 4 Sep 2003 08:06:43
• Next by Date: Very hard way to do a simple test, Ari, Thu, 4 Sep 2003 08:37:56
• Main 9000 Bulletin Board

StateOfNine.com

SaabClub.com

Jak Stoll Performance

M Car Covers

Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)