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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW Passat Family (NMS and B7) TDIs (2012+)

VW Passat Family (NMS and B7) TDIs (2012+) Discussion area for the 2012+ Passat TDI (North American and rest of world versions versions). The North American model was previously codenamed NMS (New Midsize Sedan) and the version the rest of the world gets is sometimes referred to as B7.

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Old February 27th, 2017, 21:31   #106
crisneg
Newbie
 
Join Date: Feb 2017
Location: Romania
Default Heater reduction tank adblue

Quote:
Originally Posted by docmanny View Post
I was getting the 202B fault with my Check Engine Light starting at 74k miles. I have a 2012 TDI SEL. Dealer quote was about $1200 to repair, so I figured I'd do it myself.
The part number is 561-198-970. You can get it online for the mid $400 range. I wasn't absolutely confident about my ability to do the job, so I paid a few bucks more for a return policy without a restocking fee. Here's what you get.

You will also need a torx driver and a socket wrench. You also need a hex bit. A siphon is helpful.
First step is to remove the bumper.
In each wheel well, there are 5 screws to remove. I used a torx bit with a 1/4 inch socket wrench to get in the narrow spots. It would be easier if you remove the wheels, but I didn't feel like jacking up the car. This picture was taken after removing the screws and prying the bumper away.

The top-most screw is at a tight angle
Then remove the tail-lights. Unsnap the electrical connector and unscrew the large white plastic screw. The whole assembly comes out easily.

Remove the two torx screws.

Next remove the torx screws from under the back of the bumper.
Then pry the cover off starting from each wheel well. It takes a little elbow grease, but all that's left holding the cover on are plastic clips.
Here's the Adblue tank with the cover off

There are 3 bolts holding the tank on. Two are located at the rear of the tank, and one in the front. Remove those and the tank comes right down.

Remove the foam piece and start disconnecting wires. You'll have to cut some cable ties to disconnect the mess. Don't worry, you can't reconnect the wires incorrectly later. Each clip is shaped differently. The kit comes with new wire clips also.
Now would be a good time to siphon out some of the Adblue fluid. You can use a fish tank vaccum for that (I wouldn't use it in a fish tank again though)

Now remove the three bolts holding the control module on.

Pull upwards. There is an O ring holding the module onto the tank, so you'll get some resistance.

Note the position of the arrow and the two hash marks on the tank. This will be important when putting everything back together.
Unscrew the large ring holding the heater down. Its very tight. I used a hammer and pry bar to loosen the ring. You get a new ring in the kit, so no worries.
Now pry off the top of the heater element. I used a flat head screwdriver. Remove the large O ring.

You have to rotate this piece a few degrees before it comes out.
Now that you have it off, its just the reverse to put it back together again. Beware of the arrow when you reseat the top of the heater. I made the expensive mistake of putting it the wrong place and broke the nipple off the control module ($500 retail, you can find it for $375). It also helps to have an empty Adblue tank, since it makes it lighter to reinstall on the frame.
Whole project should take less than an hour if you know what you're doing.
My problem is same 202B shorted to ground ,actualy heater is partial damaged ,after test by multimeter rezistance it is just 10 ohms ,according to manual rezistance should be 3 ohms does mean around 75watts , my car is VW variant ,did I found on supplier that spare part ,I do not know if is same code like sedan ,tank adblue of variant is located central insted of spare wheel ,in few days I'll get the parts ,after replace I'll give you my rezults .
Thanks
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Old March 2nd, 2017, 04:26   #107
crisneg
Newbie
 
Join Date: Feb 2017
Location: Romania
Default

Today ,solved replacing heater reduction thank adblue ,I would share some pictures ,but I'm not so familiar with this forum ,if someone could give some details will be useful for anyother people wich have some problem like me ,I think is engineering design problem of VW group ,in cold area this adblue system not rezist too long time .
Thanks
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