Hi all, I hope you are all well!

Like most have been trolling here for awhile and getting info about any issues I've had with my Skoda and with all the helpful people here I have been able to repair things that have been discussed here.

 

I recently did a timing belt replacement bearings and water pump all went well since was my first go at this type of car, youtube was my friend   about 3 days later the engine check light came on which was strange I thought? anyway I check everything seemed ok plugged in my VCDS and it came up with P2452 fault did some googling and checked on here to find most likely DPF sensor issue, thought I would just check over the car again removing the engine cover and found these sensors burnt out on top of the engine.

 

 

To be honest I don't know what they are and why they have completely burnt like they are. One is completely melted and the other is just about the same so therefore I need help identifying this senors and the parts numbers so I can order them and the plugs if possible.

 

 

Much appreciate any help in advance.

 

Cheers Bryan

I cant really tell where that is on the engine from the picture but the whole area looks very very sooty...
Do you have a leak from the exhaust manifold that is passing hot sooty air into this area which could have caused the plastic parts to melt?

Thanks for your reply Gabbo. See new picture they sit at the top rear of cam cover.

 

3 hours ago, Gabbo said:

I cant really tell where that is on the engine from the picture but the whole area looks very very sooty...
Do you have a leak from the exhaust manifold that is passing hot sooty air into this area which could have caused the plastic parts to melt?

 

Its the DPF sensor, its connected to the exhaust, either the DPF is blocked and the back pressure has blown one of the flexible pipes off or it came adrift for some other reason, in either case the resultant combustion gases escaping have melted everything, I have seen several others like that.

 

I suppose a crack or failure within the unit could do the same.

 

 

Was the engine running correctly and as peppy as before after the cam belt change?

 

Incorrect cam timing can result in ultra high exhaust temperatures although like retarded ignition timing on a petrol engine.

1 hour ago, J.R. said:

 

Its the DPF sensor, its connected to the exhaust, either the DPF is blocked and the back pressure has blown one of the flexible pipes off or it came adrift for some other reason, in either case the resultant combustion gases escaping have melted everything, I have seen several others like that.

 

I suppose a crack or failure within the unit could do the same.

 

 

Thank you for that, the only thing I can think of is when I did the timing belt I undid the pipes that run across the belt cover and just moved them out of the way. So it’s possible one of the rubber hoses either came off or cracked in the process and I didn’t notice it!

1 hour ago, J.R. said:

Was the engine running correctly and as peppy as before after the cam belt change?

 

Incorrect cam timing can result in ultra high exhaust temperatures although like retarded ignition timing on a petrol engine.

Yes just as good as before!

don you have the part numbers for these sensors? Can you buy repair plug fittings?

 

thank you 

This site is very useful for part numbers and diagrams...

 

This looks like the same parts (but check its the correct engine as yours):

https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/753/2/253/253064

 

6 hours ago, Gabbo said:

This site is very useful for part numbers and diagrams...

 

This looks like the same parts (but check its the correct engine as yours):

https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/753/2/253/253064

 

Thanks again Gabbo! that has pointed me in the right direction cheers. 

 

Seems like this is a common occurance when a timing belt has been replaced. I have found the sensors locally @ AUD26.00 each so I have ordered 2, just need to find the plug kit or may go to wreckers and see if they would cut off a loom. 

Try here to find the electrician connector part number: 

https://www.skoda-parts.com/catalog/octavia-4/spare-parts/electrical-equipment/wiring-harness-terminals/terminals-744.html

 

If you can find any Audi, VW, Seat, Skoda with the 2L engine I'd imagine the connectors will be the same...

8 hours ago, Gabbo said:

Try here to find the electrician connector part number: 

https://www.skoda-parts.com/catalog/octavia-4/spare-parts/electrical-equipment/wiring-harness-terminals/terminals-744.html

 

If you can find any Audi, VW, Seat, Skoda with the 2L engine I'd imagine the connectors will be the same...

Wow thank you again Gabbo! I'll see if I can find locally. Do you know if the sensors need coding with VCDS when fitting?

I don't know this sensor so much from VW but typically it is a self learning sensor so shouldn't need any coding. 

 

The ECU reads the sensor when the ignition is first turned on. 

It takes this reading as 0bar delta pressure because there should be no difference in pressure when there is no air flow. 

Afterwards it measures the pressure difference before and after the DPF to determine how full it is.

There is an adaption procedure in VCDS to calibrate it, or perhaps that should be re-calibrate, it alters a parameter called DPF sensor offset.

23 hours ago, J.R. said:

There is an adaption procedure in VCDS to calibrate it, or perhaps that should be re-calibrate, it alters a parameter called DPF sensor offset.

 

Ok Great Thank you J.R. I will search the help in VCDS for that.

Yours will probably have a description completely different and unrelated knowing VCDS, there is a search function, try using "offset" as the search term.

On 07/02/2025 at 20:44, J.R. said:

Yours will probably have a description completely different and unrelated knowing VCDS, there is a search function, try using "offset" as the search term.

 

Ok thank you again for you help. I will search once I receive the sensors and plugs I have ordered.