Hello colleagues,
Freel 2 TD4 (2.2 turbo 152kw). The usual consumption in the last two years was 8.4l/100km outside and about 10l/100km in the city. Average somewhere around 8.7. Starting from the winter, the average consumption (read on board) outside the city has increased steadily. 8.7 then 9.4, to reach 10.4 now in June. And urban at 14 liters/100km. Obviously I changed the air filter to no effect. Using my own tester (Vident) I found that I have no OBD2 errors and that in real time all the sensors are working. I understand that the MAP sensor, the turbocharger and obviously the lambda probes affect consumption. Has anyone else had this problem? What did he replace to fix?

You may get an improvement by putting a full bottle of Injector Cleaner in a quarter or less tank of fuel.

check if calipers move freely and hanbrake pads are not too tight.

Lambda probe lifespan is about 200K Km...
MAP and MAF can be cleaned.

blaster1232 wrote:

check if calipers move freely and hanbrake pads are not too tight.

alex_pescaru wrote:

Lambda probe lifespan is about 200K Km...
MAP and MAF can be cleaned.

I cleaned the MAP and MAF when I changed the glow plugs. In the technical manual it says that there would be 4 lambda sensors two before the DPF two after. I identified two at the exit from the turbo and one at the exit from the DPF, I think it would be interesting to change the one identified by the arrow. It's just that it's almost impossible to get to it, maybe from the front right wheel I could try. The connector doesn't seem too easy to reach either.

Galen wrote:

blaster1232 wrote:

check if calipers move freely and hanbrake pads are not too tight.

Thank you all for the advice. I didn't notice any heating, but I'll check carefully on the first road test.

Galen wrote:

alex_pescaru wrote:

Lambda probe lifespan is about 200K Km...
MAP and MAF can be cleaned.

I cleaned the MAP and MAF when I changed the spark plugs. In the technical manual it says that there would be 4 lambda sensors two before the DPF two after. I identified two at the exit from the turbo and one at the exit from the DPF, I think it would be interesting to change the one identified by the arrow. It's just that it's almost impossible to get to it, maybe from the front right wheel I could try. The connector doesn't seem too easy to reach either.

Irman, thanks for the clarifications. I guessed well that the sensor that needs to be changed is the arrowed one in the first photo. 5-wire adjustment sensor. I'll probably have to find someone with 1.5m arms to help me change the sensor

My bad, I made a translation error, it's TD4-2007.

If you have a DPF on a 2007 it must have been an added fitment put on at the factory. There are two EGT's Exhaust Gas Temperature sensors and one O2 sensor.

Thanks for the explanations, in the meantime I've looked into the manual. "Inflation" of oxygen sensors only has the petrol Freel2 variant. The 2007 TD4 has exactly as you say and I photographed, the heated oxygen sensor and the differential pressure sensor system before and after the DPF. Today the ordered o2 (lambda) sensor arrives and I am trying to replace it. I still have doubts about approaching this operation, from under the car, or from the side from the right wheel?

I would start by trying it from underneath. That is what I did and managed fine.
If you find access from there a problem (you do have pressure take off pipes I don't have) then maybe then try from a wheel arch.

edit: the wiring connector and securing clip can be got from above. The clip is a bit difficult to see so needs doing more by feel but it is possible. FL2 2007 2.2d Auto SE. Baltic Blue.

I replaced mine from underneath too, you need a sensor socket set, the EGT ones are 14mm. Can't remember the O2 size but a quick search on here will no doubt tell you

the o2 sensors are 22mm. FL2 2007 2.2d Auto SE. Baltic Blue.

Dear colleagues, with your encouragement, I almost succeeded. In the sense that the actual replacement of the probe did not cause me any difficulties. Up top, after demoing the intake pipes, I immediately found the connector and it came off easily. For access, just cut a plastic clamp that reinforces the wiring. Yes, the best access to the sensor was underneath. I made room by removing a metal cross bridge, then removing the differential pressure transducer piping from the bracket. Then the sensor came off relatively easily using just a 22 spanner. Unfortunately the drum-mounting holender of one of the pressure transducer pipes gave way like it was made of glass (it was baked), so I'd say I was partially successful. I will now have to look for a similar part. The drum stud thread doesn't look great either, but I hope it holds up. All in all, the problem is solved. I can't wait to get the broken part to evaluate the consumption. As you can see the old sensor doesn't look too good, it's covered in soot. Thanks a lot for the advice, I'll keep you posted on the outcome.