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OK, I'm not an MB certified tech, just an owner of several of them, incl a 98 c230. This is the first time I've heard of that one! It is about time for the 02 sensor to go bad...very expensive part... real easy (like 2 minutes) to replace. I have found searching the internet for even a used one (normally guaranteed to work) from a wrecked car saved me hundreds...well worth it. Use part # as it is actually the same on many models for about 7 years as I recall.

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Q: 99 c230 you were told that water on the passenger side floors front or back could cause check engine light to read for an 02 sensor problem told there is a relay for 02 there is this true or not?
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