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Q: Oil leak after Catalytic Converter replaced on 2001 Volvo S40

I recently have a mechanic replaced my 2001 Volvo S40 catalytic converter (with an aftermarket parts, not original). When I got the car back, oil leak is evident wherever I parked, whenever I take it for a drive. There's also burning oil smell that goes inside the car. My mechanic said that the oil leak was there even before the catalytic converter was replaced. The smell got stronger because now the catalytic converter is working okay, according to him. He said the oil leak reaches the catalytic converter.

While it was at the shop, I was told that they had to remove the turbo before everything can be installed back.

Is it possible that the engine oil leak is related to the work done with the catalytic converter replacement?

Thank you.
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I had the same problem 2002 s40 volvo took it to the shop they said came from the oil pan and the crank case portion of the engine block motor crank gaskets and the trans had to be drop at cost of $800 then took it upon my self to read into volvo forums found out that 90% of the time its going to be your gasket on your turbo return line the cost for parts are $10 for gaskets o rings and i recommend to replace turbo return line pipe $25 bucks all dealer parts. after a $35.00 repair no more leaks for the past 3years volvo is aware of this problem the older manufactured gasket o rings do not hold up well, they have sence replace with a more derable green o ring gasket. good luck.
Nothing sounds right about this repair or this shop. The turbo doesn't need to be removed to replace the catalytic converter. If a shop worked on the vehicle and didn't inform you of a large oil leak like you know have, they are performing a poor service. Get away from this shop, find a good Volvo shop and have it checked out.
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