Need DIY write-up for O2 extension Install........Please!

[Mtl996tt]

Hey Guys,

I just got a P0420 & P0430 on my 03 996TT X50 with aftermarket exhaust so I want to buy O2 extensions (bungs) and install them myself.

I do alot wrenching myself but have yet to do any work on my 996TT (I just bought it )

ANyone know where I can find a DIY write on how to install these?

Thanks

Nick

[1schoir]

Hey Guys,

I just got a P0420 & P0430 on my 03 996TT X50 with aftermarket exhaust so I want to buy O2 extensions (bungs) and install them myself.

I do alot wrenching myself but have yet to do any work on my 996TT (I just bought it )

ANyone know where I can find a DIY write on how to install these?

Thanks

Nick

Nick:

This is a relatively straightforward project, as long as you can weld.

You first have to source an appropriate bung with the correct threads to accept the threads of an oxygen sensor, then drill a hole in the exhaust pipe so that the "shoulders" of the bung straddle the outside of the hole and weld in the bung so that there is no air leak around its base. You can position the bung in the approximate position that it occupied in the stock exhaust, and that should do it.

Here's what it should look like when you are done:

Regards, Maurice.

Edited November 24, 2010 by 1schoir

[mtl911TT]

Unfortunately, amongst my many talents, Welding is not one of them.

I'll just buy the Extensions (bungs) and install them, but Im wondering if the O2's are easily accessible. Im hoping I won't have to drop the exhaust to replace them.

[ard.]

Unfortunately, amongst my many talents, Welding is not one of them.

I'll just buy the Extensions (bungs) and install them, but Im wondering if the O2's are easily accessible. Im hoping I won't have to drop the exhaust to replace them.

Slide on under and look at the O2 sensors... easy to remvoe and replace. Really no DIY needed.

But might I comment that crappy cats on cheap aftermarket exhausts are causing your issue. Just saying. High quality 100cell cats that perform cost $2000 a pair, whole exhausts using these are priced accordingly!

One comment- if you unscrew the O2 without unpluging the wires will twist up- LEAVE THEM TWISTED when you reinstall them into the extended bung, so that when screwed down the wires will untwist and ultimately be nice and straight like when you started.

GL

A

[kezcapt]

Most aftermarket exhausts have bungs pre-installed. If this is the case then just go on ebay and get the stainless extensiontubes. It's a threaded metal tube with a restricted orifice at one end. Less exhaust reaches the sensor so the sensor stays within range. You can only use this for the "after cat" O2 sensors. If you try this with the "before cat", the ecu will freak out and not know how to compute fuel/Air ratios. Lastly, you need to check heat shield clearance with your current setup. The extension will by definition reduce this space. They sell an angled extension for these situations. I use the angled extensions and the car is very happy. No CELS at all. You can , as some have mentioned, plug the bung and hang the sensors with a cable tie but my setup is much cleaner and protects the sensor for future use. Good Luck.

Rob

[mtl911TT]

Most aftermarket exhausts have bungs pre-installed. If this is the case then just go on ebay and get the stainless extensiontubes. It's a threaded metal tube with a restricted orifice at one end. Less exhaust reaches the sensor so the sensor stays within range. You can only use this for the "after cat" O2 sensors. If you try this with the "before cat", the ecu will freak out and not know how to compute fuel/Air ratios. Lastly, you need to check heat shield clearance with your current setup. The extension will by definition reduce this space. They sell an angled extension for these situations. I use the angled extensions and the car is very happy. No CELS at all. You can , as some have mentioned, plug the bung and hang the sensors with a cable tie but my setup is much cleaner and protects the sensor for future use. Good Luck.

Rob

I have a GHL exhaust.

Do you think these extentions would work?

http://cgi.ebay.com/ebaymotors/OXYGEN-Spacer-HHO-Wideband-Simulator-Sensor-Test-Pipe-/320620190328#ht_500wt_975

[JFP in PA]

I would think that your number one concern would be clearance; there ain't a whole lot of room in there..............

[mtl911TT]

I would think that your number one concern would be clearance; there ain't a whole lot of room in there..............

Im gonna measure how much clearance I have when I get home tonight.

The ebay seller told me that his extentions are 1.7inches long. So I need at least 2 inches