How to take off Oxygen Sensor

[HarrySaimbhi]

Guys have been advised i need to replace the upstream oxygen sensor, any ideas on how to? Where abouts is it, and what else do i need to remove in prep for it? Any hints/tips gladly appreciated.

Apparently this could be causing the misfire on my car when its idling.....

 

[grober]

It's probably the "fore" of the 2 fore and aft lambda sensors associated with your catalytic converter. Their position and access varies from car to car and some require a special wrench to remove them without damaging the associated wiring. Since you don't say what model of car you have its difficult to give any more info.

 

[HarrySaimbhi]

Sorry mate its a C220CDI 2004 04 plate.

 

[grober]

Not sure exactly which engine you have but this might be helpful? çàï÷àñòè Mercedes: êîäû çàï÷àñòåé ìåðñåäåñ

 

[jaymanek]

its much easier to access from under the car and will most likely come off with a ring spanner.

 

[HarrySaimbhi]

is this the upstream one Jay? i thought its more into the engine bay?

 

[grober]

You might need one of these or something similar a 2mmx150mm open socket. LaserTools 4701 - Lambda Sensor Socket
Sometimes they come out easily sometimes not. People have been known to use a suitably applied blow torch to slacken the threads of the old one. Don't apply torque while the exhaust/ cat is very hot or you may strip the female threads!

http://www.youtube.com/watch?v=bgXV3Umqxt4&playnext=1&list=PL63C294167EF4DC27&index=5

ps don't overdo the new sensor antiseize compound-you don't want it contaminating that new sensor!

 

[Bellow]

Getting some penetrant releasant on prior to attempting removal will help. An overnight soak if possible.

 

[BillyW124]

where is the Lambda usually located on the 124