service engine light on 2000 Suzuki Grand Vitara

I repalced the catalytic converter and the sevice engine light sitll came on. What else is the problem?

Asked by for the 2000 Suzuki Grand Vitara
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Silly as it sounds, 8 time out of 10 it is the sencer that is bad not the part noted for replacement. Emissions syetem is the worst DGK Boise