i got estimate of 600 $
Replace catalytic converter
Yes.
About $80.00.
Take it to Midas Muffler.
No. It's illegal.
All O2 sensors (AKA Air/Fuel sensors) are threaded into the exhaust system. Some before the catalytic converter (upstream) and some after the catalytic converter (downstream).
It will really mess up the fuel mileage,and driveability
You can remove it and put a pipe there, or you can remove the exhaust pipe and drive a piece of pipe through it if it's clogged up, but beware of the EPA laws. The check engine light will stay on if you remove the converter and the vehicle will not run correctly. It is illegal to remove a catalytic converter.
This will be located probably just before the catalytic converter on the exhaust
Take it to a muffler shop.
The scrap value of a catalytic converter from a 2002 Ford Focus typically ranges from $50 to $150, depending on factors such as the condition of the converter and current market prices for precious metals like platinum, palladium, and rhodium. Prices can fluctuate due to changes in the metal market, so it's advisable to check with local scrap yards or recyclers for the most accurate valuation.
"Positive Crankcase Ventilation" Catalytic converter burns up oil smoke sucked out of the engine from the PCV.