2004 s500 what is the error code P0422 and P0423??

Discussion in 'S-Class' started by Tony West, Aug 9, 2017.

  1. Tony West

    Tony West New Member

    I think its my 02 sensor when i looked it up but my car jus started acting funny....my check engine light came on like a week ago and I need to get this fix so i was thinking about changing the both upper and both rear....? Am i in the right mind frame of it? Help please

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