VW Assist with DPF Sensor Fail

Faults and Technical chat for the new Volkswagen Tiguan
xtrailman
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Joined: Mon Jul 16, 2018 3:16 pm

Re: VW Assist with DPF Sensor Fail

Post by xtrailman » Tue Sep 08, 2020 5:21 pm

If the sensor is faulty you may not get any blocked DPF alarm if it is blocked, that's my point. Or you might get one when it isn't blocked.
2019 SEL 190ps diesel.

CNC
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Joined: Mon Oct 16, 2017 5:59 pm
Location: South West UK

Re: VW Assist with DPF Sensor Fail

Post by CNC » Tue Sep 08, 2020 6:06 pm

xtrailman wrote:
Tue Sep 08, 2020 5:21 pm
If the sensor is faulty you may not get any blocked DPF alarm if it is blocked, that's my point. Or you might get one when it isn't blocked.
Yes you are right. When mine was diagnosed with a failed sensor the dealer did a forced regeneration to empty the DPF as far as possible so I knew it wouldn't block up too soon, so my 1500 miles was just under three tank fulls of diesel so not enough to cause a problem on this occasion. When the new sensor was fitted they did another forced regeneration to empty anything that had accumulated which wasn't much according to their diagnostic measurements.
2018 MY SEL 150 TDI DSG 2Motion in Caribbean Blue with reversing camera & park assist plus fully debadged

xtrailman
Posts: 1288
Joined: Mon Jul 16, 2018 3:16 pm

Re: VW Assist with DPF Sensor Fail

Post by xtrailman » Wed Sep 09, 2020 8:13 pm

Regents usually take place around 250 plus miles, so in 1500 miles I'm surprised the dealer didn't find much in the filter?
2019 SEL 190ps diesel.

CNC
Posts: 2563
Joined: Mon Oct 16, 2017 5:59 pm
Location: South West UK

Re: VW Assist with DPF Sensor Fail

Post by CNC » Wed Sep 09, 2020 9:14 pm

xtrailman wrote:
Wed Sep 09, 2020 8:13 pm
Regents usually take place around 250 plus miles, so in 1500 miles I'm surprised the dealer didn't find much in the filter?
The once a tank regeneration is a 'passive' regeneration, you will not necessarily notice your car doing this, the 'active' regeneration is the bigger one where you notice your idle is high, stop/start doesn't work etc and much more soot is burnt off.

The active regeneration doesn't happen as often as the passive and requires a higher temperature so when the dealer did a forced 'active' regeneration it is to clear as much soot as possible hence I was fine to continue driving for quite some time. This is when you sometimes park up and the fans keep running and you get the burning smell as a much higher temperature is required.

Passive regeneration is usually once a tank. The G505 sensor that failed on mine gives the 'measured' DPF soot level, but without the sensor it can also 'estimate' (calculate) the soot level depending upon the recorded driving so you may still see the DPF warning on the dash if it 'thinks' the DPF is becoming full.

Image
2018 MY SEL 150 TDI DSG 2Motion in Caribbean Blue with reversing camera & park assist plus fully debadged

xtrailman
Posts: 1288
Joined: Mon Jul 16, 2018 3:16 pm

Re: VW Assist with DPF Sensor Fail

Post by xtrailman » Thu Sep 10, 2020 5:13 am

That's good information CNC the 250 miles I mentioned was something I read on Facebook so could have been for the older system.


Chap looked at his ECU.
2019 SEL 190ps diesel.

jhibbs93
Posts: 89
Joined: Thu Aug 29, 2019 4:49 pm
Location: Aberdeen, Scotland

Re: VW Assist with DPF Sensor Fail

Post by jhibbs93 » Sat Sep 12, 2020 7:22 am

teefster wrote:
Sat Aug 29, 2020 7:57 pm
tmg349 wrote:
Sat Aug 29, 2020 8:48 am
why this is not done at a service is beyond me, rather than wait for the fault to occur.
The cynic in me says cash strapped VW are happy to let as many of their customers foot the bill for this defective part outside of warranty whatever possible.
Agreed! Mine went just 2 months out of warranty, £580 later...
2016 (66) 2.0 TDI BlueMotion SEL 4Motion (s/s) in Tungsten Silver Metallic. Purchase date: 7/9/19 @39,200 miles.

Earl_H
Posts: 380
Joined: Thu Oct 20, 2016 2:31 pm
Location: Next to a Zoo (UK)

Re: VW Assist with DPF Sensor Fail

Post by Earl_H » Mon Dec 14, 2020 2:25 pm

Sorry to restart an old thread but mine has just gone down but the garage think its somewhere inaccessible - if VW assist fixed it on the drive that its relatively easy to get too.

Does anyone have a picture of the location?

Edit - found it on the top of the engine (hiding under a bit of silver thermal protection) they aren't VW specialists but are honest
SEL, 190PS, DSG, 4Motion, Indium Grey, 20" Miramar Alloys, Area View, Heads Up, Factory Towbar, Sports Suspension
Tig Name - "Das Brick", Towing Elddis Affinity 550

CMGILFOYLE
Posts: 3
Joined: Sun Nov 17, 2019 9:10 am

Re: VW Assist with DPF Sensor Fail

Post by CMGILFOYLE » Tue Dec 15, 2020 12:51 am

I had mine go on me too recently.

Easy to swap out yourself until you need to realign it to the ECU!

I was about to swap mine myself until I watched YouTube and could see someone else did and still had to take it the garage to get the ECU to recognise it!
VW Tiguan R-Line - Tungsten Silver - 2.0 dci - Roxy

Earl_H
Posts: 380
Joined: Thu Oct 20, 2016 2:31 pm
Location: Next to a Zoo (UK)

Re: VW Assist with DPF Sensor Fail

Post by Earl_H » Wed Dec 16, 2020 5:18 pm

Hi CMGILFOYLE - Yes when I "found" it, I thought 10-minute job but then realised that it needed to be recalibrated to the ECU (after a forced regen to get the differential pressure "zero"?) I left it to the garage.

An interesting point they ended up with three DPF sensors - two with differing size inlet tubes but the old unit had equal-sized tubes but all had the same part no's ?

Costs - £65 for the sensor - due to the equal-sized tubes no doubt & £30 labour, shows how easy it is to fit.

Cheers Earl
SEL, 190PS, DSG, 4Motion, Indium Grey, 20" Miramar Alloys, Area View, Heads Up, Factory Towbar, Sports Suspension
Tig Name - "Das Brick", Towing Elddis Affinity 550

Andy1979
Posts: 53
Joined: Thu Dec 07, 2017 3:01 pm

Re: VW Assist with DPF Sensor Fail

Post by Andy1979 » Thu Dec 17, 2020 9:20 am

Sounds like I was lucky - mine went 3 months before the warranty expired. No signs other than amber engine management light. Fixed under warranty back in September and they did the sunroof drain tubes while they were at it.
Tiguan Elegance 150 TSI DSG 2WD Moonstone Grey

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