Check engine light came on , checked flash code is 21-oxygen sensor. I
went in to pick one up and guys asks which one, upstream or
downstream? He says I have to take my car somewhere to have them both
tested. I would like to know how much I should expect to pay for the
tests and installation. I know the part will be either $53 or $73.
Also, does anyone know how much it can effect fuel efficiency and
engine if I don't replace? Thanks in advance.
K
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