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Just a quick update - Car has been driven over 1,000 miles since I replaced the O2 sensor and the light is still off. It must have gone through a few regen cycles by now so I guess what's left inside the CAT is good enough for now.

I sent my kid over to the shop and he got a sticker. The car started off with an insufficient egr flow code, then the NOx cat got trashed so the clamp at the inlet must have been loose which triggered the egr code. I welded up the damaged case on the cat and put it back together with part of the...

Oilhammer, thanks for the clarification on the device. I can only seem to find limited information regarding the various components in this exhaust so it's good to know what it actually is. I guess this NOx adsorber is the precursor to the DEF systems used now? Anyway, very different from a...

There's actually not much value in a diesel cat, at least compared to one in a gas car, because they don't have rhodium. They cut these cats open at the joint, install a new core and then tig weld them back together. Mine is pretty banged up so I doubt they will want it for that. They could...

How's the NOx Cat? I'm in need of one for a 2011.

I can probably check for continuity by pulling the sensor out and seeing if it reads anything. In a very rich environment it reads 0 volts. Regarding a new catalytic converter, I'm totally screwed because I'll never get the $700 core credit for this banged up thing. Has anybody been able to get...

Trying to figure out how best to address a damaged converter on a 2011 Sportwagen. The clamp apparently came off between the DPF and the converter without my son knowing and the converter hit a raised manhole structure which dented the housing and broke the core. It also dented the O2 sensor. I...

Got it back together and it's running nicely. I wonder when it let go. The car has been giving an P0401 code for insufficient EGR flow. If that connection was loose and the exhaust was blowing out there instead of going through the EGR circuit, that might be the cause. It would be great if that...

That's it. I looked into this a bit more and the catalytic converters on a diesel are not the same as a petrol car. The DPF deals with the diesel specific particulates but then the catalytic converter cleans up the NOx and the carbon monoxide emissions like you have with a gas engine. However, a...

The one that got trashed is actually the front one. Every diagram I found showed it as part of the DPF assembly. It looks like this thing fits many gas models. Is it just a standard catalytic converter? I'm wondering if I can weld a universal cat into the pipes and get this going. I'm planning...

My son was driving his Sportwagen today and apparently the clamp between the DPF filter and flexpipe and the catalytic converter had fallen off without him knowing. The converter ended up hanging down a bit and he hit a raised manhole on a highway that was being milled. The front of the housing...

I just pulled the 2 sensors and checked the lines. I blew through them with air and they seemed clear. Nothing in the sensor nipples either. I had cleared the codes yesterday but today it was showing the P0401 code again even though it only was driven maybe 8 miles. I didn't have much time with...

Well, the car is back and has a P0401, P2459, pending P2271 and a historic P240F. The tailpipes are clean. When I wipe inside them there is nothing. I guess I need to check the lines to the sensors and then go from there. It seems to run great and it's still getting 40+ mpg. He smashed his left...

Thanks for all the replies. It seems to be running fine up there for now. I'll dig in to it when it gets back in May and I'll be sure to update the thread.

Hoping that's all I will need. Based on the symptoms and history of the vehicle it seems like it is a bad sensor. It appears that the downstream O2 sensor in a tdi is similar to one in a gas engine vehicle in that it just checks the function of the emissions system and doesn't impact the...

My son hasn't used the car since he got back to school but he was able to get an OBD2 reader from a friend and the only code that it showed was a P2271. Maybe it's just a bad sensor at this point. I know driving it with a bad sensor isn't ideal but I'm not sure how his affects a tdi. I had a...

He's up in Orono, Maine which is next to Bangor. There must be a good indy shop up in that area.

I am in Duxbury, but the car currently isn't. Looks like you're my parts source. Probably should have checked that sensor too, but that code didn't return after the EGR cleaning and my time with it was limited. I'll have to get my son to find a place to read the codes and see if that one...

That's what I was afraid of. The DPF has about 57,000 miles on it. Not cool. From what I have read, you can drive with a cracked DPF for a while. The car is now about 4 hours away so it will be a bit before I can replace it. We have annual inspections here that include emissions for cars under...

I picked up a 2011 Sportwagen last summer that my son took to college. It had about 116k on it and had recently had the timing belt, water pump done. The car had also had the AC system replaced when it was purchased from a dealer with about 60k on it and the DPF and EGR were replaced with about...