70-90 km less drive on each tank of diesel.

No varing lights, whent to Skoda service they plugged in the computer everything was fine.

No leaks.

This high consumption started almost over night.  

Big question mark. ???

Don't have any specific experience to share with your particular engine but most responders will suggest and/or ask for (as starting point):

 

Tyre pressures all wheels

Full diagnostic scan for any logged or pending codes

Visual check /  replace air filter

When was fuel filter last done? 

Check all wheels for binding brakes.

Possibly, dpf reported parameters 

 

 

Edited 13 March, 20233 yr by TheClient

      Usually high fuel consumption comes with loss of power and maybe smoke/strong smell of diesel on the exhaust, is that your case too?                    Scanning for codes doesn’t reveal everything without checking live data 

I'm always sympathetic with anyone experiencing worsening fuel consumption but I do wish more information was presented for those assisting.

 

'Almost overnight' but how long ago and for how many refills has the increased consumption been noted? Was it coincident with any event; servicing, new tyres, drop in temperature etc?

How many km has the car done?

What is the driving profile like? How many km each week? Typical journey length? Does the car get a reasonably frequent long journey for a diesel particulate filter to regenerate?

 

Have you noted any indication that an attempted dpf regen has failed to complete? High revs/fan running/burning smell?

 

What does 70km less distance covered represent in percentage terms. Do you note the 'since refuel' consumption when you refuel and is the worse consumption similar in percentage terms to the reduced distance covered?

 

There will be other questions but these will provide some background.