My check engine light says on. I was told the main problem is catalytic convert

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converter and emissions evap detector. The cost to fix both 625.00. I was also told I needed link pins replaced and that I had several oil leaks around oil pan gasket and valve gasket the second set of problems would cost an additional 725.00 they said the converter in that cost is aftermarket. the codes for the converter and emission detector were in the ECU