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Discussion Starter · #1 · (Edited)
If anyone can help me I will praise you for the rest of my life.

I bought this POS a few months back, had the typical water damage from the drains being plugged the airbag sensor under driver's side was defective from this. Did the brakes, battery, headlight level sensor the usual Touareg issues.

Anyway, I was heading for vacation camping several hours up north and all of a sudden driving on the highway BANG! the entire car jolted forward and it felt like we were going through the windshield. On further diagnosis I noticed the gear selector was highlighting right before it would slam. So I did the first obliviously thing: rebuilt the valve body with sonex valves. Transmission place that put fluid back in for me said it's fine. After driving for a couple hours BANG! Again same issue slamming while driving out of no where only this time the green brake sensor for pulling it out of park came on. So I took it back to the S**T hole that put me in this position in the first place and they said it was the shifter, so they removed mine I brought them one from a wrecker and to keep the story short I ended up getting pissed off and taking the car back and started driving it by selecting the gear without the shifter, moving the cable to select gears. It seemed to be ok after 2+ hour burn but let's be serious we wouldn't be here if it was. Sure enough BANG! AGAIN! It f**king did it again. I don't even know where to start.

It does this while changing gears sometimes, and sometimes not, even with no throttle it will shutter but not slam entirely.

It seems to be after extended drives only or when it hasn't rested for some time.

Valve body has been changed.

The shifter is been removed.

Shifts like butter now tho.

The truck is in shambles.


This truck takes joy in kicking a man while he's down so hopefully you guys can help lift my spirits because I'm $6k in to this thing and ready to give up with no hope in site.

Please I have scoured these forms and the only possibility left I can think of is updates due to TCM bugs?

Oh and to top it off now the headlights flicker randomly.

Also the girlfriend is ready to leave me over hearing about it.
 

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You probably should check the speed sensor. Mine did frighten me two or three times banging under load. Then the speed sensor just died and the treg stalled after being hard driven for about 30mn. Replaced the sensor and did the usual maintenance and all is ok. Sensor is called g28. Around 50$ aftermarket or 120$ from vw. I’ll put the part number later. You should also go under the car and check everything is ok, drive shaft bearing support and drive shaft rubber flex disk. Both are easily visible.

G28 part number:

022 957 147 A




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And you really need a vcds scan to see if you have other issues causing this. You can always replace the g28 for 50$ but you need the vcds cable to find out what the treg is complaining about. Otherwise you’ll be just replacing parts until your pockets are empty ! If you don’t have a vcds cable get one from rosstech. You need a windows tablet or laptop.


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Discussion Starter · #4 ·
Would this cause the car to feel like it's going into park while driving? It seems plausible to me. The only related codes I got from the VAG were CAM position sensor and triptronic. I will scan tomorrow and update.
 

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If you intend on keeping the treg you better spend the money on a vcds cable instead of diagnosis sessions at shops. And generic scanner won’t help much. Trust me. Consider the vcds scanner a critical part gone bad and you need to replace it.


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Discussion Starter · #7 ·
If you intend on keeping the treg you better spend the money on a vcds cable instead of diagnosis sessions at shops. And generic scanner won’t help much. Trust me. Consider the vcds scanner a critical part gone bad and you need to replace it.


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I have a VCDS scanner codes are:

3 Faults Found:
17755 - Camshaft Position Sensor 2 (G163) / Engine Speed Sensor (G28)
P1347 - 002 - Incor. Correl. - Intermittent - MIL ON
17748 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28)
P1340 - 002 - Incor. Correlation - Intermittent
17887 - Brake Boost Vacuum System
P1479 - 008 - Mechanical Failure
Readiness: 0010 1101


2 Faults Found:
01045 - Tiptronic Switch (F189)
008 - Implausible Signal - Intermittent
00789 - Backup Switch (F41)
009 - Open or Short to Ground - Intermittent
 

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Ok now that’s good stuff there.
Let’s start with the speed sensor.
And fix the brake boost issue.
The other error won’t be causing you that bang you’re experiencing. A friend is has been driving with that error for more than a year now.
Get a new speed sensor and ask your mechanic to replace it. Let me know if he does not find it. It is near the oil cooler.
For the brake booster issue you need to check the hose coming from the brake booster to the vaccum pump behind the passenger side headlight. I will post a link to a thread showing you what that is.


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Discussion Starter · #9 ·
Ok now that’s good stuff there.
Let’s start with the speed sensor.
And fix the brake boost issue.
The other error won’t be causing you that bang you’re experiencing. A friend is has been driving with that error for more than a year now.
Get a new speed sensor and ask your mechanic to replace it. Let me know if he does not find it. It is near the oil cooler.
For the brake booster issue you need to check the hose coming from the brake booster to the vaccum pump behind the passenger side headlight. I will post a link to a thread showing you what that is.


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I can handle the speed sensor/vaccum line tomorrow. I swapped the valve body (transmission place rebuilt it and diagnosed it) and I knew better than to replace fluid myself. I didnyt trust myself to diagnose (more like my gf didn't). I will do the speed sensor and vacuum line tomorrow, scan and update you, honestly I have three days off. Thanks for your help.
 

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Here you go



Follow that hose and you will find some cracks either on the check valves or at the firewall. I guess the cracks must be after the junction going to the intake manifold otherwise you would be seeing lean condition errors.
Just use some electric tape to block the leaks as the vacuum pressure will pull on the cracks and not blow the tape off.
You will notice better braking
 

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Discussion Starter · #11 ·
I can handle the speed sensor/vaccum line tomorrow. I swapped the valve body (transmission place rebuilt it and diagnosed it) and I knew better than to replace fluid myself. I didn't trust myself to diagnose it from the beginning(more like my gf didn't). But none the less I will do the speed sensor and vacuum line tomorrow, scan and update you, honestly I have three days off. Thanks for your help.
 

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Another tip is to remove and test/prime the chain tensioner to see if it helps with the other issue (chain correlation). You need to remove the air duct going to the throttle body. It’s there underneath. I will add some links so you can see where stuff is. A lot of things to check on the 3.2 to make it run smooth.
Get some spare frech oil and try to prime the tensioner. If it’s dead you need a new one from vw.


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Here is a vid on priming the tensioner. It’s not touareg specific. Just to show you what it means:
The tensioner is a 27mm bolt if I remember well. Located behind the throttle body.




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Use this thread to measure the health of your chain: take pics or log everything. Do it with a warm engine and if you can do it while driving too that would give you a better idea.
If you don’t know how to do advanced logging with vcds let me know.




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Discussion Starter · #16 ·
I guess Nooby doesn't run these forms anymore lol you do. If I don't get to the tensioner tomorrow don't kill me but let's see if I can tape the vaccum lines temporarily, and swap the speed sensor. I'll take it for a good run and scan.

In regards to the chain I have no noise but the a*hole that owned the car put improper oil in for a few oil changes so it's likely going to need a little more than the tensioner, the service records are basically how not to maintain a Treg.
 

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Discussion Starter · #17 ·
The speed sensor sounds bang on. It shifts funny going up small inclines, then will completely shutter slash stall for a split second causing it to thud. Not to mention it would take a few turns of the key to start. My dumbass should have taken the codes more seriously instead of dumping $2k into a valve body.
 

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Yeaaah nooby gone missing :-(
I’m still bringing back to life my 3.2. Not my daily driver so repairs are done at ease. The first oil change I did I was shocked too. Had to do oil changes every 2 or 3k km. Lots of stuff to check and repair afterwards. I even relocated the vacuum tank just to make it easier to work on the beast. I’m currently fighting with the variable intake changeover valve. I replaced the oem bushings with gruvenparts ones and a year later the noise came back stronger. You will experience that too sometime in the future if you keep it. Have owned it since 2017 and man a lot of work and money but I’m enjoying it


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The speed sensor sounds bang on. It shifts funny going up small inclines, then will completely shutter slash stall for a split second causing it to thud. Not to mention it would take a few turns of the key to start. My dumbass should have taken the codes more seriously instead of dumping $2k into a valve body.
I just hope they haven’t messed up the transmission. Mine is still working fine wirh a minor hesitation from 4 to 5th gear when tranny is hot. Barely noticeable. I did the first atf complete flush two months ago with ravenol type iv atf and it’s been working fine so far. Took me about 12L to flush it all using the pan removal and cooler lines trick.


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