Blocked dpf bank 1 lamba sencor problem

Hi every 1 sorry if this is in the from place I have a c200 cdi sport 10 plate the engine light was on and of for a few days then stayed on so took it to a mate to plug in comes back with DPF blocked no other codes so booked it in to get a terra dpf clean week later fella plugs it in on the day comes back with dpf and bank 1 lamber sencor as well plus a reading of 30 psi witch was very high so he said to get Merc to plug it in as I could be wasting my money on the dpf clean of if it needs the lamba and a air/ pressure sencor Now every 1 I have spoke to have said the lamba sencor will come on if the dpf is blocked ?? So was thinking get the dpf clean / unblock done and get him to reset all the codes and go from there Merc want £170 to just plug in clean in £200/£250 so fort try that or am I wasting my money sorry for the long post any help at all will be grateful thanks

 

Thanks for that bit of info

 

Took the car back to day the dpf is clear no lamba sensor code was on thy was testing all the pressures and test on the wires thy have said its lost the earth wire to the pressure sensor and needs chaesing back to were it gone that's why it's comming back with diffrent codes has any 1 got any info on this sort of problem it's going in to a auto spark Tomoz any help on this problem would be great thanks

 

Thanks Pete hopefully it's an qick and easy job and the earth wire has just come lose or rubbed though let you know what the out come is apparently mercedes have a common wireing loom fault

 

Well the wireing is sound the auto spark Said it's the sensor that needs replacing its not sending signals so 2 weeks later going round in circles could of been a sorted in 1 day £60 part £30 labour that sound about right ?

 

He's a freind of a freind so fingers crossed its sorted Tomoz