Live data from diagnosis and egt sensor problem

Exp21

Senior Member
Joined
Dec 17, 2018
Messages
347
Reaction score
88
Location
Italy
Your Mercedes
s204 C200 CDI Blue Efficiency MY2012, w245 B200 CDI Facelift
Hi eveyone. I made a thread about an egt sensor error on my w245 euro5 CDI (https://forums.mercedesclub.org.uk/index.php?threads/b16-14-exhaust-temp-sensor.184523/#post-1859454). I have a problem: in the meantime that I was waiting for the new sensor to come, the check engine light turned off by herself. Today, noticing that the car was repeatedly trying to make a dpf regen I connected my Autel diagnosis and I observed live all the egt sensors values. I found:

- B16/14 (suspected faulty egt sensor) 100° C
- B19/11 (sensor upstream turbine) 650° C
- B19/8 (sensor downstream KAT) 714° C
- B19/9 (sensor upstream DPF) 608 °C

This is only an instantaneous. Values were constantly changing up to about 730° C. But the B16/14 was always around 100° C, even on full gas and engine load. Considering the position of this sensor (is half way between exhaust manifold and egr valve), do I have to think sensor is damaged? Why did the error turn off by himself if the sensor is still giving abnormal values? I don't understand. If I check all the values with engine turned off from 4 hours I find the B16/14 around 65° C (which is strange because coolant is 35° C and is the only hot part in the engine).
I think the sensor gives high values when cold and low values when hot. Do I have to replace it or the value of about 100° C during a regen is normal? Thank you!
 
Last edited:

You lost your key ? Or maybe you need a spare! Your vehicle imobilliser does not respond anymore? WE CAN FIX THEM ALL !! Mobile ! Save Time and Increase Profits With us !
Top Bottom