Install DPF Yourself: Inspection by TÜV/Workshop?

Hello everyone,

My 2001 ALH AT Golf will be fitted with the retrofit DPF/catalytic converter from Bosal this weekend (360€). This is because my original catalytic converter is partially rusted after 230,000 km, and I have the emissions test (AU) and technical inspection (TÜV) coming up soon. Fortunately, most of the cost for the replacement will be covered by the government.

I'll do the installation myself, because I also want to replace the rear shock absorbers, and I don't want to pay a "specialist workshop" €100 (that's what they want for replacing the catalytic converter) for removing the underbody panel and loosening/tightening 5 screws, only to find out later that 2 out of 3 studs on the VNT are over-torqued and the particulate filter is installed incorrectly.

Now, my question is:

Der Filter-Kat wird mit ABE und einem Antragsformular für die steuerliche Förderung geliefert, dass normalerweise die einbauende Werkstatt ausfüllen muss - berechtigt sind hier alle Werkstätten die auch eine AU durchführen können. Das wI am cold.

"Who can fill out this form for me when I install the system myself, so that it is accepted by the registration office/tax office? Has anyone here had experience with this process and the associated costs?"

I'm getting conflicting information here: some say the TÜV (German technical inspection agency) can approve the modification, others say any workshop can do it, still others only certified experts, and some say it can be done as part of a regular vehicle inspection at a TÜV testing center. What does it cost? Who knows the exact details?

How does the tax credit for government subsidies work?

Do I need to go to the registration office first to have the updated emission classification entered?

- What is the cost of registering it in the official documents?
- Who reports the information to the tax office regarding a tax credit?

Please provide the text you would like me to translate from German to English. I will only provide the translation, without any explanations or speculation.

Thank you in advance for your responses. I will also be conducting some measurements (performance, opacity, pressure, temperature) even after the surgery is successful, and I will report on those findings here – I am also quite curious myself.

Best regards from Bavaria.

Ash on my head; the answers were already provided by matthias96 in an old thread because he had already upgraded his system.
According to his statement, the TÜV (technical inspection agency) charges €35.70 for the inspection and €13.10 for the registration authority.

Hi.

Has anyone perhaps already had experience with the Bosal Oxi catalytic converters, maybe with a Golf 4 ARL engine? What about performance and fuel consumption?

Sure, here is the translation of the text from German to English:

"MFG" stands for "Mit freundlichen Grüßen," which translates to "Sincerely" or "Best regards" in English. It is a common way to end a formal letter or email.

I have the Bosal part installed on my vehicle (and it's registered and inspected ).
Okay, so it works like this: you simply install the part, take the necessary documents, and go to the TÜV (technical inspection authority), who will register the change. Then, you'll need to obtain a new certificate from the registration office, which will inform the tax authorities about the change. You will then receive a credit from them. That's how it generally works. The TÜV registration costs around 30 euros, and the documents cost another 12 or 15 euros (I don't remember exactly).

The Bosal part fit perfectly for me; the workmanship looks surprisingly good. The only issue is that the included brackets don't fit my car. However, you can use the original ones after removing any rust.

The power consumption must be below the detectable level; I haven't noticed anything unusual, and the performance is as expected.

Interestingly, this device has a volume that is about one-third smaller than the OxiKat.

@bavarian:

What are your initial experiences with the Bosal retrofit DPF on the ALH engine?
"I'm also very interested in an upgrade, as the weld on the Oxikat is already showing signs of wear and won't last much longer. Furthermore, I generally believe that an open DPF is a good thing, provided that the side effects like increased fuel consumption or reduced performance remain within acceptable limits."

Were you able to observe any increase in fuel consumption or loss of performance under the same driving conditions?

Regards,
Alex.

@bavarian & matthiasTDI96!

Now I'm really curious to read your experiences. I'm particularly interested in the topics of performance reduction and increased fuel consumption.

Regards, mcgregg.

Hello,

Okay, I can only tell you that: I don't notice any subjective difference, and it's not possible to objectively measure anything. My fuel consumption always varies depending on the amount of driving I do to get to work (slowly, at 90 km/h on a well-maintained road with no inclines), and occasional faster highway driving. So, it's hard to say definitively, but according to the car's onboard computer, I can still achieve my previous fuel consumption figures.

I also don't believe that the Bosal part will last long; it has such a coarse grid that it visually appears to have larger mesh openings than the original OXI cat. To be honest, I also fear that the Bosal part wouldn't withstand a real test, which fortunately doesn't exist. It's a really cheap product. However, with the subsidy, it's almost like getting it for free, and if you need a replacement anyway, it's a bargain.

Still the same: I'm not driving it because I have such a strong sense of environmental responsibility...

matthiasTDI96 wrote:

To be honest, I also fear that the bosal part wouldn't withstand a real test, which fortunately doesn't exist. It's a really cheap piece. However, with the subsidy, it's almost like getting it for free, and if you need a replacement anyway, it's a bargain.

Hi Matthias,

Did you install that part as a replacement for the broken original catalytic converter?
Did it need to be welded? (For example, does that mean the old flexible pipe remains in place?)

If it's installed between the standard threaded connections (charger and VSD / center pipe): What is the quality of the pipes up to that point? Do they rust faster, or are they more prone to cracking (as far as can be said at this time) compared to the OEM catalytic converter?

Hi Ulf,

"No, there's no welding involved, which is great. You simply unscrew the original part from the turbocharger all the way to the connection behind the catalytic converter and replace it completely with the Bosal part. I came up with this idea because my flexible pipe was leaking. It was a minimal leak, but I really saw it as a preventative measure. The fit was perfect; the only thing was that the bracket didn't quite fit without using the original one. But that wasn't a big deal."
The quality is different; it's not comparable to the original part. This one had some superficial rust after 100,000 km and would have certainly been easily repairable. I'll take a picture of it in the next few days.
By the way, the KBA number is located on a welded metal plate, which looks very professional.

Hi.

Could someone possibly post a photo of it installed? Where did you buy the catalytic converter?

Best regards.

Tdi.

Hi,

The "Bosal" product sounds appealing to city dwellers suffering from the effects of fine particulate matter pollution. However, I'm curious about the delivery catalog.

http://www.diesel-oxikatfilter.de/files/pdfs/DPF-Katalog_2007.pdf

It's unclear whether a dice was used as a selection tool. Take a look at the Ibiza II... there are some really interesting combinations: The popular AFN engine before the facelift (i.e., up to 1999) is completely missing, and after the facelift (1999-2002), all TDI engines are also absent, as only the ALH and ASV were installed. I would be surprised to find an AGR engine in the Ibiza 6K facelift. However, the Toledo does have the ASV engine, so it can't be due to that.

Does anyone see a system or logic behind this? It sounds like random things were just added to the list to filter something arbitrarily.

Basically, it's a useful and completely legal way to move money .

With the prices mentioned, you essentially break even if you install it yourself, and you also avoid the hassle of potential driving bans and don't have to argue with "eco-zealots" who believe that a TDI engine with a yellow sticker is worse than one with a green sticker.

I think I'll write to them .

Best regards,

January.

HI.

The whole thing would also be of great interest to me, as this cat is actually available for a self-cost contribution of about €100. If you factor in the potential resale price of the vehicle, it's practically free }.

Hello,

How does it all work?

Is there any money from the tax office for that, or will they offset it against the next vehicle tax payment?

Unfortunately, the weld seam on the catalytic converter of my car is also rusted through.
In March, the vehicle tax and emissions test are due. I would proceed with this before then.

Sure, here is the translation of the text from German to English:

'MFG' stands for 'Mit freundlichen Grüßen,' which translates to 'Sincerely' or 'Best regards' in English. It is a common way to end a formal letter or email.

Hello,

Actually, this is where my review of the Bosal retrofit DPF should have been...

...but there is currently no approval from Bosal for my ALH with automatic transmission.
According to Bosal, however, this may happen soon. I'm curious, but also pessimistic, as I know the approval regulations quite well, and it will be difficult to get the ALH Automatic approved. (First, you have to find a production car that meets the EU3 emission standards.)

... by the way, this subsidy will be deducted from the next vehicle tax payment due.

Best regards,

Hi,

Quote:

According to Bosal, however, this may happen soon. I'm curious, but also pessimistic, as I know the approval regulations quite well, and it will be difficult to get the ALH Automatic approved. (First, you have to find a production car that meets the EU3 emission standards.)

Hmm... that also takes away a little bit of my hope... because I received the same answer from Bosal. The number of unregistered ASV-Ibizas in Germany that haven't yet been modified by young drivers to wrap around the next tree is probably so small that you could count them on one hand... maybe I should offer myself as a tester for approval (but it's questionable whether it would really be worth it).

If they happen to find a 6K with a facelift and an AGR engine (which, according to my information, doesn't exist), then maybe they could also consider an ASV Ibiza.

Best regards,

January.

Interestingly, this thing has a volume that is about 1/3 smaller than the OxiKat....

In this context, it is completely incomprehensible to me why such a part is not offered for the Lupo/Arosa platform .
There certainly won't be a shortage of space.

Recently, while replacing the exhaust, I took a look inside the catalytic converter. The channels were surprisingly clean; at least from what I could see, they didn't appear to be clogged. In theory, a catalytic converter should also be able to 'burn off' any deposits that accumulate, especially if it gets extremely hot under full load.