VW Touareg DPF and Audi Q7 DPF filter FAQ and Adblue fluid FAQ

28 Oct 2014 | Author: | Comments Off on VW Touareg DPF and Audi Q7 DPF filter FAQ and Adblue fluid FAQ

Audi Q7

VW Passat, Touareg, and Audi Q7 TDI DPF and FAQ


This FAQ shows how the DPF particulate filter works, DPF and DPF clogging problems. Adblue and refill procedure, Adblue and Adblue fluid storage are at the

For the TDI engine found in the Audi A3 VW Golf, and VW Jetta TDI, see the specific to those engines in 2.0L TDI engine DPF FAQ. The is that they don’t use

VW Touareg TDI, VW Passat and Audi Q7 TDI are shown but this FAQ can apply to the BMW 335d, BMW X5 xDrive35d, Benz GL, ML 320 or 350 BlueTec, E320 or any diesel car that has DPF or Adblue they work the same.

The the 2.0L TDI engine 2012+ VW is included with the 3.0L is because they all use Adblue.

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Summary of the emissions system in Q7 TDI and VW Touareg TDI, Passat TDI

are four major components to the system along with a of sensors and an exhaust fluid The sensors are written into the management computer so if you delete the DPF or the DPF with a DPF delete kit, it set a check engine light and the car may not run The correct way to delete the DPF is to also the computer programming.

The oxidation is basically the same catalytic that was found on older

Diesel Particulate Filters catches particulates in the exhaust. are most of the black soot you may remember from older trucks. Because of the DPF and more engine management, the tailpipe much cleaner than cars. To meet ever emissions standards, they first equipped in North on the 2006 VW Touareg TDI V10. cylinder bank got 1 DPF.

The only Touareg that have one was the first year V10 engine. The Touareg wasn’t for model year 2005 so VW could catch up to emissions where they added the DPF for year 2006.

The Adblue pumps Adblue fluid to a injector which sprays into the exhaust stream it’s catalyzed in the last the NOx catalyst where it cleans up NOx Because diesel engines run lean (much more air fuel) compared to gasoline they can get better fuel However, the extra oxygen in the air is also turned into NOx combustion.

This system can cut NOx by up to 80% which lets them be in all 50 states. All Q7 and Touareg 2009 and use these. All North American 2012 and later also these.

For more info on the VW Touareg, see 1000q: 09-10 TDI buying guide. For info on the new 2011 Touareg, see 1000: Touareg TDI buying guide. For on the 2009-2011 Audi Q7 TDI, see Audi Q7 buying guide. For the VW Passat, see 1000q: mk6 Passat TDI guide.

Fitting the Adblue in a smaller body is one of the delays in the A4 TDI in the US and North America.

You must use Ultra low sulfur diesel

The reason why older cars use a DPF is because the fuel in North didn’t meet the ULSD ULSD has 97% less sulfur in the than the older fuel you may still find for off road and use and in Mexico. The sulfur will clog the DPF and cause damage to the

Today, all pump fuel in the US and Canada is ULSD. Even if the pump doesn’t have the the refineries have already over.

The delay was partly because didn’t want to make for cars that couldn’t from them and you couldn’t cars that didn’t usable fuel. Part of the with the early introduction of the DPF in is that not all fuel was ULSD in when the 2006 VW Touareg TDI going on sale. The other is that biodiesel may not work well in Touareg or Q7 because of the system operation and post injection.

How the DPF filter works and how the fluid and NOx catalyst work

See videos first. The left shows the emissions system. right is another video the whole system and other (Audi Q7 TDI shown but can also to Touareg and Passat).

The basic routing is shown below. right is a closeup of the Adblue The oxidation catalyst is tucked to the engine.

In the spliced pictured you can see the DPF, NOx catalyst, and the Adblue injector. The lower left on Touareg is the fuel tank.

The above show a Touareg but the Q7 TDI system is basically the same. The Q7 has a Adblue tank and longer because of the longer body. might be tuned slightly for the different car weight/load but they use the engine and the system already with engine load/rpm/etc. so I know for sure.

Below and are thumbnail images of the Q7 system the dual tanks, click to

The lines to the lower tank is why the Q7 to burp out a little air while it. The upper tank is the active where you add fluid. Excess drips down to the lower

The lower tank has a pump to it back up to the active upper where the Adblue pump the fluid for injection into the

Whenever you add fluid to the Q7, you are supposed to do a adaptation. More details

Below is a thumbnail of the VW Passat TDI system. It serves the same but has been adapted to fit the Passat.

The step – the catalytic

The oxidation catalyst is used on TDI as well. It has to be close to the engine to up as fast as possible to a minimum temperature of 250 o C. The energy is used platinum and palladium catalysts to hydrocarbons and CO into water and This is a pass-through filter, that gasses and particulates through small tubes the length of the filter.

If you hold it up to the you can see through it.

The second step the DPF

Unlike the first cat, the DPF is a blocked off filter. Gasses can through the filter but particulates are If you hold it up to the light, you can’t see it.

This is why the cars can pass the handkerchief test. They are of silicon carbine with and aluminum oxide catalysts.

As it particulates, the little tubes fill up with soot and backpressure. You want the lowest backpressure downstream of the turbo so DPF do vehicle performance and efficiency. they are federally required devices and effectively remove of particulates, do not delete the DPF on your or Q7 TDI.

Below is an illustration typical DPF filter construction.

vs. passive DPF regeneration

Acceleration or engine load burns fuel which heats up the gas temperature (EGT). When EGT are 350 o C, the DPF begins to passively self by oxidizing and burning out the trapped When the car is coasting down or in stop-go trips, EGT doesn’t get hot and the filter can’t burn out all the

This causes them to up.

If the filter is loaded beyond 45% (or 466-621 miles/750-1000 km), the sensors can tell that the is getting clogged and will the car’s computer to start an regeneration self clean After the engine combusts all the the fuel injectors squirt extra fuel into the cylinder which is instantly and travels to the first cat converter. It and raises EGT to around 600-650 o C provides the energy to clean out the

The big difference between the 3.0L DPF and DPF found in Jetta/Golf/Audi A3 TDI is that the engines use a DPF that is right the engine and the first cat. The engine DPF is relatively far from the catalytic converter. It’s not yet

During a regen cycle, the ECU boost slightly to make up for any in power and it may raise the idle rpm If you interrupt an active regen by shutting the engine off, it finish and should restart the time regen conditions are

If the regen cycle is interrupted by off the engine, previous cycles due to bad fuel, or soot loading 50-55%, the car will to force a 15 regen cycle. There is no light to show when the car is in regen mode. If it continues to be or fails, the DPF warning light on the (pictured right) will on.

If that happens, drive at 40 mph for at least 10 minutes in 4th or 5th gear at (Disclaimer: faster would be as long as you don’t exceed the limit).

If your DPF light on (shown at top and below) and it’s not the exhaust back pressure or exhaust gas temperature sensor be faulty.

At 75% loading, the glow light will also on. If it gets to this point, go to the car serviced. It’s still to do a service regeneration, a manually active DPF regen unless is something wrong with the

If clogging reaches 68 grams engine) or 95%, you must the DPF from the car and manually clean it. The it has to be manually cleaned is because all the will raise heat to the where the filter can be damaged. which is caused by your style or bad fuel is not covered by the warranty. There is also a emissions warranty.

VW and Audi inspection of the DPF at 120,000 miles. stops are used to cleaning DPF so I cleaning vs. replacement. The filters contain precious metals.

it’s right under the any repair shop should be able to remove it but you can’t the car without it.

DPF cleaning procedure and interval

As stated before, I buy a replacement DPF because of the cost. I see no why the DPF cannot be removed and cleaned. At the metal housing might to be cut open and rewelded to clean the but I’m sure this still be cheaper than a new one because of the precious metals. is also why catalytic converters are stolen. Cleaning is a common for heavy duty trucks.

The min use of a duty truck filter is miles w/scheduled cleaning and according to the EPA.

The reason why the become clogged is because they are blocked off filters trap particulates. Pass catalytic converters will let pass through them. DPF trap all solids including that weren’t designed to be in the engine, like byproducts low quality fuel, non combustibles the normal burning of additives and metal particles in the engine or other.

Unlike the Jetta/Golf/Audi A3 the DPF in your Touareg or Q7 is right and easy to reach. In the other the front subframe has to be lowered to it.

Volkswagen says that supposed to check the DPF at 120,000 for ash loading. If it’s OK, check it 10,000 miles afterwards. If replaced it’s good for 120,000 miles. 68 grams is the limit for 3.0L engines. 5.0L V10 Touareg had a scheduled of every 120,000 miles.

it says to check the V10 DPFs at miles and every 20,000 after that.

Audi to check the DPF at 125,000 miles for ash If it has more than 68g of ash content it be replaced. Inspect it every miles afterwards until it replacement.

How to check DPF filter or loading on a Touareg TDI or Q7 TDI

Plug the cable into the OBD2 and start the software. You must access to the dealership tools or the tech VCDS tool to be called vag com). Make the cable is plugged in all the way and the LED light is

Select the control modules and go to You’ll see the screen below. You to look at values so click on Blocks -08.

Set the first to 100, the second to 101, and the to 102 and you’ll see the screen below. The number in group 100 is engine I’m pretty certain the is engine coolant temperature.

The is a regen timer and the fourth is if the was aborted. 0=not aborted, 1=

In group 101, the fourth is the regen status. 1= heating up. 10= in progress. 100= cooling

Group 102 number 1 is the temperature the cat. The second is the temperature the DPF.

Adblue Fluid info

Adblue tank

and how to add Adblue fluid

If you have questions or comments about or why a DPF delete or DPF bypass is illegal, free to ask in the myturbodiesel.com forums

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