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The check-engine and EyeSight lights came on together on my Subaru, and the dealer's ten-minute scan ended in a $2,100 quote for a catalytic converter. A colleague suggested a second opinion first. Dale smoke-tested the exhaust and sent me a photo of grey soot escaping a split $38 gasket just upstream of the rear oxygen sensor. The repair came to $240 with the diagnostic included, and six months on there has not been a single warning light.