So my Superb has been pretty much faultless since buying it at 92k miles. I change the oil at 10-12k, filter at 18-20k, very glad I fitted Bilsteins.

 

The time has come to do the cambelt again at 151k miles, as I opened up the heat shield wrapping on top of the engine, under the top engine cover, I found this mess.

 

Can someone identify the sensors, my guess is one is the dpf differential pressure sensor, is the other a load sensor ?

 

I had a MIL come on a couple of days ago, so this must be why.

 

Any advice/diagrams appreciated

 

 

It'd likely help if you stated which engine this is

Thanks for the headsup....It's the diesel 2.0, 150HP  Common Rail . MY2016

 

There's a sort of tinfoil bag with press studs normally wrapped around this sensor assembly, at the rear top of the engine. A couple of chrome pipes loop across the cambelt cover and feed up into 2 rubber pipes going into the foil/heatshield packet.

 

Bit of a mare of a job, but manageable.

Dunno if this is any help to you at all https://skoda.7zap.com/en/cz/superb/sup/2016-851/1/

I dont think its in there, I can only see exhaust/turbo, but it doesnt show the pressure measurement devices/system

The melted DPF sensor after a cambelt change is very often issue. It happens because the plastic hoses get brittle from the high temp over time and during the belt service these sensor hoses get broken.

 

Buy a new genuine sensor based on your car’s VIN. It’s very easy to fit if no other parts were damaged - just two screws if I recall correctly.

 

The new sensor also requires software adaption and you’re done.

Ive got VCDS for the coding.

At least 2 plugs have melted, and the sensors they attach to are too badly burned to get a part number.

 

Do easy to use partlists exist online ?

I've only got the MkII Superb so only know their engine codes and not the Mk up or below, I'm not sure what your ones are.

 

However I use lllparts for their isometric drawings it takes a bit of getting used to as certain items are not under what we think they would be!

 

They break it down into multiple link headings as you'll see when you go on the website.

 

https://www.lllparts.co.uk/catalogs/skoda/CZ/SUP/851/9

 

This is for the Skoda Superb Mk III.

 

Hope this helps you in some way.

 

G

Edited 6 July, 20241 yr by G1980
Forgot to say there are link headings for each category system that makes up the Superb

https://www.lllparts.co.uk/catalogs/skoda/CZ/SUP/851/2/253/253042

 

That seems to be the area I think you're talking about.  But you need your own engine block code to narrow down the correct engine and sensor part numbers from the diagram.

Thats the one, thanks.

Two of item 41,  906-015.1,  are required

 

Darkside list them as 906-051B, maybe there's a typo mistake in the part number somewhere, but it looks like the right part, physically. And is listed for the Superb CRLB

https://www.darksidedevelopments.co.uk/products/dpf-differential-exhaust-pressure-sensor-03l-906-051-b.html

 

As for the wiring harness and melted plugs, that'll need a trip to the breakers if I can't find the correct connector online

Edited 7 July, 20241 yr by fixitsan

I've managed to clean up one soot covered melted ex sensor with a cotton bud and water, and can make out 03L 906  51B now.

 

There's a seller on eBay who sells them with a new plug and six inch long wire tails attached, so repair isn't going to be too bad now

 

For now I've clamped up the pipe where the exhaust gasses are blowing from. Car isn't needed for a week, luckily, and I use the motorway frequently so I don't think I need to worry about the dpf.

14 hours ago, fr1nklyn said:

The melted DPF sensor after a cambelt change is very often issue. It happens because the plastic hoses get brittle from the high temp over time and during the belt service these sensor hoses get broken.

 

Buy a new genuine sensor based on your car’s VIN. It’s very easy to fit if no other parts were damaged - just two screws if I recall correctly.

 

The new sensor also requires software adaption and you’re done.

 

 

I can see why that might happen, but this happened all by itself, and was only discovered because I had a reason to take the engine cover off, so they seem to possess the knack of self immolation !

Someone decided to put a plastic sensor next to the DPF which reaches 500-600C.. Yes, there is a shield but it’s a poor engineering decision.

It happens from at least 10 years and there are cars completely burned because of this issue.

I feel that the position is fine. My guess is the sensing element degraded internally, allowing a hole to develop.

With a hole internally, exhaust gas is able to then flow through the sensor, transporting heat internally directly from the exhaust, to the sensor internals.

It has melted away from the inside out, not outside in.

 

Easy to fix at least

 

Looks like recall worthy to me

Do you know of a recall for DPF pressure sensors ?

I've found more info on another forum, seems quite common, and as mentioned previously the movement of pipes to remove the TB cover might cause the sensor port to crack.

https://forums.tdiclub.com/index.php?threads/dpf-pressure-sensors-melted.514897/

Mine was already like this before starting the TB change, the last TB change was 60k miles ago (2 1/2 years), so it might just be a brittle plastic/random failure.

 

£18 for each new sensor, with new plugs and wiring, isn't the end of the world.

6 hours ago, fixitsan said:

I feel that the position is fine. My guess is the sensing element degraded internally, allowing a hole to develop.

With a hole internally, exhaust gas is able to then flow through the sensor, transporting heat internally directly from the exhaust, to the sensor internals.

It has melted away from the inside out, not outside in.

 

Easy to fix at least

 

 

Exactly this! For such a small, low range sensor it must have a really thin and delicate diaphragm inside so it will be far from immune to failures.

Yes I think there are more modern sensors which use different techniques. But in reality 1 failure in 150k miles is perfectly acceptable to me

2 hours ago, fixitsan said:

Do you know of a recall for DPF pressure sensors ?

No I mean there should be one, can’t imagine you’re the only one and pretty sure anything which can potentially cause fire is recall worthy.

 

I don’t think dvsa or vosa accept reports from people which is wrong imo

I've contacted DVSA about an issue - and not one that had happened to me - yet, they will claim to note any contacts from drivers/owners and reply to emails, I'd think that after that it will be up to many many others to contact them before they take any action, like communicating with the car manufacturer's  UK representative, any follow up action with depend on how that comms with the car manufacturer's UK representative went. All the communications that they receive will get it's own reference number.

2 hours ago, Danoid said:

No I mean there should be one, can’t imagine you’re the only one and pretty sure anything which can potentially cause fire is recall worthy.

 

 

 

If they had mounted this sensor in a rediculous place where it could burn the car down really easily there would be a good case for a safety concern but the fact they put the sensor inside a heatproof pouch, potentially to mitigate against any further damage and this thing burnt up without the driver even knowing then there is absolutely no chance they will be interested in this.

 

If you can give example of cars that actually set on fire or some cremated remains you might stand a chance.

@SuperbTWM @Donald I'm sure I've seen VAG cars completely burnt from this issue but I couldn't find where I read about them.

 

However, I'm pretty sure not a single safety regulation is violated here, by the fact that something may catch fire under car's hood, several inches from the fuel filter and fuel lines. Covered with heatproof shield or not, it's risky.

Came back from holiday and as expected the new sensors were here.

They're 'noname' brand, or unlabelled Bosch (who knows ?), purchased instead of originals due to the new plugs and wire tails which came with them, so that I can get back to work in the car tomorrow without having to waste time sourcing new plugs etc.

 

It took under an hour to splice, solder,wrap and seal the wire transplants.

 

Once the car started the codes were cleared, and by the time I drove to the nearest motorway the oil temp was warm enough for a regen to begin as soon as I hit the motorway. I've done a few stop/starts, and battery-off reset, no codes, all working fine. I'll monitor how often it regens and then consider doing a sensor adaptation if it needs it.

 

MPG reading has increased (better economy) back to where it previously was.

 

But another problem has occured since not using the car for a week, I guess due to some condensation, the electric windows are misbehaving, the two rears weren't working at all but now work fine, but the fronts are very intermittent. I can hear the window relays firing briefly as I drive along, so there's a source of CANbus noise somewhere.

 

All windows were in the down position this morning when I woke up, but the remote hasn't been touched. I'll have to monitor this.