I have a 15 plate Octavia Scout diesel.  From start the engine heats up to 90 degrees C and stays there.  However the engine overheat warning comes on and then is on constantly for the jouney.   The car does not appear to have a limp mode but it does seem to slow the engine.  The coolant system is normal, the overheat sensor has been changed.  Does anyone have a similar issue and can a main dealer repair?  I think this may be a software issue.

Hello, can you post an image of this 'engine overheat warning' that you are seeing?

Can you get it scanned for fault codes?

It's most likely to be the water pump sleeve....

 

Take a look at this thread: 

 

1 hour ago, langers2k said:

It's most likely to be the water pump sleeve....

 

Take a look at this thread: 

 

--- But if that was the case, the temperature gauge would indicate higher temperature. OP says that temp gauge stays at 90 deg.

Even allowing for widely reported tolerances in gauge reading, if the coolant temperature is rising sufficiently to trigger any secondary warning, it should be noticed on the gauge.

@LoadaSkoda are you able to post an image of the temperature warning reported? 

I don't know if there is such a thing

 

Probably the low coolant expansion tank level indication.

Edited 8 January, 20251 yr by J.R.

You should get a DTC scan done to find why this fault is being generated. I understand that this indicated fault remains even though the over-temp sensor was replaced?

Unable to see the temperature gauge needle in that image, but looks to below 100 deg.C.

the temprature never goes above 90 degrees C.

Mine is a 2015 Yeti being the same platform as Octavia, all I have is the Maxidot which my MK2 Octavia had, I had not appreciated that a 2015 MK2 facelift Octavia had a coloured LCD dashboard with information like that displayed.

 

I agree that a VCDS or equivalent scan is the next step to take.

Definately get us a scan via VCDS or ODBEleven.  The temperature sensor for the temperature gauge is measure from the block, so its possible that one of the other temperature sensors has either failed or is failing.  Do you get an issues with the Heating system?  If you get hot/cold spots, then recommend that it might be a problem with Silica bag that has split in the header tank.  You will need a full flush out and new header tank in that case.