ChrisG

Went to fit a decat downpipe to my MY00 today but found the lamda sensor seized in the original downpipe. Didn't want to force it too hard and strip the threads.
I'm sure I've read on the BBS in the past that the sensors can be cross threaded in the factory when new, is this true?
If that is the case what is the fix........new lamda sensor?

DaveHiggs

have you tried wacking the end of the spanner with a lump hammer to try and crack torque first? It helps to prevent you stripping the thread.

ChrisG

Dave,
I did manage to get about a quarter turn on it but it then seemed to seize up. I know stainless steel threads can "pick up" and seize. This might be what has happened.
Chris

dowser

I had the same - I took a chance and removed the old d/p with lamda attached.

A single squirt of wd-40 into the inside of the thread freed it up no problem.

I guess it depends a lot on how damaged the thread is now?

Richard

David_Wallis

try removing whilst the exhaust is still hot... If you can get to it...

David

topdog

does this lamda sensor fit back on the scoobysport downpipe or is it only used on the origional pipe?
thanks
Dewi

Bob Rawle

Common problem, trick is to crack the sensor thread when cold, use a spray of wd40 once cracked and then it should come out, if its picked up then spray with wd40 and be prepared for a stripped thread, can recut the thread in the d-pipe and clean up the lambda sensor thread with a needle file usually otherwise its a new sensor, use copper grease to refit and don't over tighten, just nip it up to hold tight.