Hi to everyone

I own an Octavia Mk3 2014 2.0 TDI engine CKFC, DSG gearbox, VIN TMBJJ7NE8FOO41449, second hand.

Four months ago, oil, filters, O2 sensor before catalytic converter, replaced. The DPF was cleaned too. The car passed the emitions control. No errors, no

From this time i observed, when the car start rolling at the 1st and 2nd gear, instant fuel consumption about 30-40lt/100km. Long term consumption 12lt/100km for short trips in the city, 10lt/100km for mixed trips, 7lt/100km inthe highway for trips 50-500km. I ride fast, but not aggressive. Before I had 5.5-6.0lt/100km for long trips, and the mixed consumption was not high.

That is my issue one. 

The second issue is that i would to know if for this engine exist a post catalytic o2 sensor. 

The link bellow shows a VCDS log atempt. The bank 1 sensor 2 has zero output. That time i was able to select the second O2 sensor, now i can't find it in the VCDS list.

I went to a parts seller and he told me that according to vin there is not post catalytic O2 sensor but in the description of the part shows that fits in the 2.0TDI 110KW CKFC.

Please tell me if the car has that sensor.

Thank you for your time and i appreciate any help.

 

https://log.tunezilla.com/chart/905951#H8KLCABOJMKeZwIDwq3Dkk1uw4MgEAXDoMK7wrAeJHBMHMKfw4XDssKCw5ZTB8KJwpoIwo/Cq8K0wqdvSH/DlEXCn8KlwqJuWMOMwqcnBmbChkE9wqbDp8KHwrDCsMKec8OaLsKrIjNSKcOGwpTDgxsrUj7DhsObOcOzw4LDmQvCqw9dXjjCi8KWwqTCr8OaX0NJwpErw6LCp0nCv37Cl1QOw7NZw67CkcKVw6UHDMKOwo7DlFE/wpLCsnfDtsKbwqTDtRLCg3xdaMObUj7Ch8KJw7XDpMOFw5/DoiVnSMOyw4bCv8KJwoXDkkA5QGnCoTgoRygdwpQTwpQewr8Uf8KCwqEnH1fDkB0kwrPDkwQMOUwWU8KDw6nCgMKpw4V0w5p7FsOuw5DDrMO1w7HDt0XCssO/wroubcONw6jDu8KqHcKrw7lXV8K1ZMK2asOyTcOVUsOswo3Ct8O7wqTDsR1kw4dIwrrDugQAAA==

 

I just checked my mk3 2.0tdi post o2 values and it was 0v too. Im interested to see what you find out. Im struggling with a similar problem. All values seem ok but my fuel consumption is around the same of 10lt/100km. 

Edited 2 February, 20251 yr by jaychen

36 minutes ago, jaychen said:

I just checked my mk3 2.0tdi post o2 values and it was 0v too. Im interested to see what you find out. Im struggling with a similar problem. All values seem ok but my fuel consumption is around the same of 10lt/100km. 

Did you replace something or what else happened before you start have increased fuel consumption?

I suspect everything as i don't have the knowledge, maf, agr valve, throttle valve.

The next steps are reset adaptation of o2 sensor and reset throttle valve. 

The o2 sensor behind the catalytic converter probably not exist in my car. I'm out of mechanic for now.

It is so strange, before i had bad o2 sensor, dpf clogged and the fuel consumption was relatively low.

I hope someone will help us.

 

1 hour ago, vgoctav said:

Did you replace something or what else happened before you start have increased fuel consumption?

I suspect everything as i don't have the knowledge, maf, agr valve, throttle valve.

The next steps are reset adaptation of o2 sensor and reset throttle valve. 

The o2 sensor behind the catalytic converter probably not exist in my car. I'm out of mechanic for now.

It is so strange, before i had bad o2 sensor, dpf clogged and the fuel consumption was relatively low.

I hope someone will help us.

 

No nothing has changed at all. Just terrible fuel economy.