Florian_pl

Hi Guys, I have read that there is a one main sensor for ECU, but I have read that there is another sensor for gauges. I am not sure whether it is true but from some reason two different apps are detecting two sensors. From other side I need to agreed that app softwares have limitation and cannot be fully trust. Regards

Hello, I have recently look to my Octavia mk3 2.0 TDI (engine code: CRMB) 17MY and I have noticed that readings of the engine coolant temparature sensors are stange. Depend of the app which I have used I can see two sensors: Engine coolant temperature 1 and Engine coolant temperature 2. The redings for engine coolant temperature 2 showing conatantly -40 deg. Questions: 1. Does it mean that my engine has a 2 sensors? 2. What impact to engine it might be? 3. Where the sensor 2 is placed in the engine? I was googling, but it showing me place of the main coolant temperature sensor. To complicate this I have checked on other app (carscanner) and it showing me bit different results and the name of the sensors is different. The carscanner showing me "[ECM] Radiator output coolant temparature: actual" and "[ECM] Radiator output coolant temparature: commanded" Readings for actual is 2222 deg. where comanded is 80 deg. Questions: 4. Is the "[ECM] Radiator output coolant temparature" sensor the same as "Engine coolant temperature 2"? One of them showing -40 deg. second 2222 deg. Both values are insane. 5. If not the same what is it? I am bit lost in those readings and I will be appreciate for any help. Just to mention that I am trying to find a reason why my car has higher fuel consumption and what I have been learned those sensors might have something to do with my issue. Regards Florian.

Hello Guys, Thanks for feedback No it was not, rpm were about 750. The oil and oil filter has been changed at 1st July. I have been in Skoda so I am assuming that they have put correct one. The readings showing that DPF is OK, I have done small sesion to capture few parameters to see how they are behave during stop and drive, I have combined three pictures of different parametes with reflect to rpm. Part 1 is showing air temp and MAF, from some strange reason readings has stoped recording. It might be that I have clicked someting during short breake. Part 2, air/fuel ratio normally should be about 14.7. What I can see it is about 4 and sohastically going up when rpm increasing. Does it should be conversely? I am not sure this variability, it does not look good for me. Part 3, readings of O2 sensor (lambda sensors). What I have read is that the mA should be around 0 mA otherwise fuel mixture is rich or lean. What I do not like again is this vairability. O2S1 looks like have higher values constantly where O2S2 has proper values on the begining, but the end is rubish. Basically when I was googling I have found information that so high increase consumption of the fuel is matching with lambda sensor failure (up to 50% higher consumption and less power during acceleration). There is just one problem, there is no DTC error. Any ideas what it might be? Sympthoms are muching to lambda sensoer failure, but there is no error. I have been today to do MOT and surprisedly I have passed MOT. After my findings I was pretty much sure that I will fail MOT, but I did not. In the service they have explained to me that for diesel they are not doing the same emmision test like for petrol engine. Anyway they have ignored me when I started talking about my readings. For them there is no error so there is no problem. I will be much appriciated if somone can have a look on my readings and advice what I should do next. I would prefer to take some more measuremnts from the car to better understand what is happening rather that replacing bit by bit.

Hello, A bit of updates what I have done, but first questions for which I am appreciated. I was not driving much during lockdown, but definitely I had to refueling once or twice. During 2 weeks of my holiday I have done trip to Poland and back. It had a good charge. I have been in Skoda with this issue they have saide that they scan the car and no errors were found. I have done scanning today with "car scanner" and no errors were found. I have done scanning of my car and looks like DPF is OK, anyway I am going to check DPF more cerfully with propper app for DPF. Back to the car, today I have checked airfilter, pictures attached. I am not an expert, does this need replacment? During checking car two things captured my eye 1. Fuel consumprtion durring idle, it was 2.3 liter per hour. No A/C or mirros heating, just engine. I was expecting values about or below 1 lietr per hour, see attached pictures. 2. Emission test, there are few points which has failed. Is it something which I should worry? Just to add on Monday I have scheduled MOT, wonder now if I will pass it. See attached pictures. During car scanner there were a lot of sensors and readings. For most of them I have no idea what they are showing. Can someone advise on what I should focus on? Please see screen shots from the app in zip file. Regards. carscanner.zip

Hello e-Roottoot, Many thanks for reply. Yes, welcome to the forum will be soon. Regarding your questions I will try to better explain. Q: How many miles had the car done when you got it and how many now? I bought that car with 31198 miles on a clock, now I have 40185 miles. Q:How often is the car doing regens? A: Not sure what are you asking for. What I have observed is that the car quite often has higher idle rpm, about 1000 instead of normal 750. I assuming that is a DPF cleaning. Q: Why not give the very expensive Shell V-Power a miss and even their Regular Diesel and go brim the tank someplace else. A: Are you suggesting that there is something wrong with the fuel? I can go and refuel on other station, but how this might impact mpg? Q:Saying per tank gives no idea of how many miles per liter you are getting. Is there a nice clean air filter fitted? A: There is about 40 liters sometimes 42 liters during refueling and I am doing 280 miles. I've done math, for calculation I took 41 liters for a tank. As a results came up: 1. That currently my fuel efficiency is as an average 31.1 miles / gallon or 9.1 liters / 100 km. 2. For previous mentioned 450 miles per tank that efficiency is as an average 50 miles / gallon or 5.62 liters / 100 km. That is is a bit what I can see. Previously I had to to about 100 miles until fuel gauge start moving down. Now it is just 40 miles. At the moment I have just bit more than half tank and I have done 130 miles. Regarding air filter, it was replaced on the 1st July (main service in Skoda), but in the mean time I was driving in rural area where was a lot of dust. I will check how actually it is looks now. Regards

Hi Guys, It is old post but maybe somebody will reply, I am not sure whether some solution was found. I have my octavia from the December 2019, reg 16. I was using it through the last winter and summer with doing about 450 / 480 miles per tank. All the time after refueling I am resetting odometer. It started in September where I noticed that on one tank I have done just 280 miles. I have used three tanks so far and still the same just 280 miles per tank. I have been in Skoda, but ofcourse they do not see a problem, no errors. Car is in good shape. I have visited as well independednt garage, but they have said the same. No errors, no problem. I am going to check car with OBD II but not expect any obvious things to find. Much appriciated for any advice. Just to add I am using V-Power before and after issue came up. At the moment I am suspecting DPF, as my idle rpms and not going down below 1000 even if engine reach temperature. The thread with fuel filter seems to be interesting. Many thanks