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Originally Posted by jcyuhn
All -
I've been chasing down the driveability gremlins on my 1993 300E. I now need to replace the O2 sensor - car still has the original sensor after 13 years/110K miles.
Any tips on how to get that puppy out of there? I soaked the threads with penetrating oil a few days ago. Access to the O2S isn't exactly great. Is it worth dropping the exhaust system to make more room? What kind of tool is the best to use?...
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Jack up on drivers side front jack piont... used an oxygen sensor socket, from any parts store (has a slit down one side to let the wire pass through), and a Craftsman 3/8ths rachet with a pivoting head (to get up around the exaust tunnel) and a piece of pipe as a cheater bar.
Old one out and new one in and routed in less than 15 mins.