pat056

Can anyone direct me to one? My 996 appears to be running rich and I know in the Tundra, this was the 1st sign I had b4 CEL came on. I figure at 80,000 miles, it might be getting to be time.

Dr_KarlB

I got mine from Oxygensensors.com (Renntech recommended) for my old 996
Easy DIY. Make sure you have a big open end wrench.. 19mm i think (but could be wrong)
There are different ones for Pre and Post Cats, and a pair on each side.

Enjoy!

Doug Donsbach

Why do you think it is running rich?

Tippy

There are metal clips holding the O2 leads to the body. As the doc said, an open wrench will work, crowsfoot would be better though. The plugs are located on the drivers side of the engine compartment beneath and left of the airbox.

Loren

I wouldn't replace anything until you read and diagnose the fault code(s).

Macster

condition and lean out all cylinders of that bank until rich signal falls to within spec or the ECU uses up all its adjustment. At that time a CEL will likely be set.

Or it might be a misfiring spark plug/cylinder. Misfires generally trip CEL very quickly.

Or it might be O2 sensor.

If engine really running rich ECU should flag this pronto too because an overly rich exhaust is death to the converters and those are about the only items Porsche's emissions equipment warranty cover... So naturally the ECU is particularly sensitive to anything that can damage these devices.

Sure car doesn't have gas leak somewhere that smells like an overly rich exhaust?

Sincerely,

Macster.

Mother

I agree with Loren, I use a durametric and it is a nessecary tool for diagnosing problems and clearing faults after repairs.

pat056

I just noticed my exhaust tips were a little blacker than normal. I wiped them off and haven't driven since (weather here is crappy). My wife drove it last and she was fighting 5:00 traffic, something I never have to do in the 996 as I work in the country. Maybe that caused it to leave more residue on the tips? Or maybe it's just my imagination.
No CEL. I just figured 80k was about time for the O2 replacement...not so huh??

Ubermensch

If it ain't broke, don't fix it.

perryinva

Find someone with the Durametric or Autoenginuity software. You can monitor the actual O2 sensor outputs while driving, and have them logged (inthe Autoenginuity, at least). If they work..they work. If one is crazy slow, or limited compared to the others, then repalce it, even w/o a CEL. That's just one reason I bought the software..

ArneeA

I thought it was... "If it ain't broke, fix it until it is"

Ubermensch

That used to be how I operated and then I got enough experience to realize the wisdom of the original version. The next best advise I ever got regarding mechanical things was, "If you ever feel yourself getting angry put down your tools and walk away. You're about to break something that is going to be more expensive and take a lot longer to fix then you were orginally working on."

pat056

Danged if THAT ain't good advice! Pardon the NY accent
There's been many a time that something just baffles me, then I go away and come back later and the fix is obvious!

ArneeA

That's good advice also. Someone also told me "You'll know if it's torqued once your elbow clicks"