Get your previous CAT installed in your car or Get Kabali CAT Con from bilal gunj Lahore or Shershah Karachi. Never ever remove CAT Con from your car. Kabali Cat con will cost you around 6k to 8k in a used condition as new one is very costly. Cat con can be clean easily. Never clean CAT Con with acid. After installation i think check engine light will gone.
Another question Do you scan your ride what error code / DTC code recorded in your car ECU?
Note: New Cat Con price is i think 50k +
I hope this will help you.