oxygen sensor "extender" for LC100 - rear sensor for bank one

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Interesting. So just replacing the O2 sensors didn't work for you?
 
replaced the front O2s, error does not show O2 sensor being bad. Seems like putting extender makes P420 error go away. Much cheaper than replacing O2 sensor. And definitely than CAT replacement
 
If you can't find the extenders with the flanges for sealing to the exhaust, just replace the O2 sensor. For $46 and the same amount of labor, I think that will keep the code from coming back after you clear it. The cats are tough and very rarely go bad. The O2 sensors can trigger seemingly unrelated codes if they go bad.
 
I'm looking for extendor with flange
 
wow - I've seriously been searching for this exact kit for days now. Have you used this specific item yet? Thanks in advance!
Not yet. I've welded in some high flow Cats and just left the original DS sensors in place. Hasn't thrown a code yet, when it does ill install these. not looking forward to it as the studs are very ordinary
 

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