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Re: GM dealer says P0420 caused by downstream sensor. What say you?
Posted to Technical Discussion Forum on 3/10/2007 1 Reply

Yes,

However how many times have you seen an oxygen sensor fail in that manner? Dropping out and then springing back to life several times in a matter of seconds? I don't think I have ever seen it in 18 years. I am sure it is possible, but the timing would h... Login to read more.

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