O2 sensor woes – CE light won’t go off!

geminisyr

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I have a 1997 S420 with the CE light on. I got the usual O2 sensor failed error codes (4 of them on Bank 2) so I had a local shop replace one of them with an OE sensor. The very next day the CE light came back on and now it shows 6 error codes for both Banks – P0153, P0130, P0150, P0156, P0136, P0160. It now says that both O2 sensors are bad! Has anyone experienced something like this before? Any clue as to what’s going on? :confused: Thanks in advance for your help!
 

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