The replaced O2 sensor was done 4 yrs ago, 16K miles ago.

Thanks for the opinions so far.

I just thought I recalled that one could activate code sequences by turning the ignition switch on/off several times without needing a meter device.

Any clues?

I don't feel like buying an el cheapo or otherwise meter. The next step would be to have the mechanic fix it.

So, I am trying to gather info to see if I can do it myself before handing it over.

Thanks

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD