Most likely it's an EGR valve problem. try unhooking egr then drive it, if the problem goes away, you just need to replace the egr valve.
Many reasons.... One, some catalytic conv have porcelain inside that brakes in pieces and makes malfunction such is block it. Two, some others have fiber glass which "melts" and once again...blocked. and another reason i can give you is the driving habits you may have sometimes driving slow is not the best for your car, take it out to ride on highway once in a while, gets rid of the "soot" inside, specially if you don't use premium gas. hope i helped....ABGDA
Most likely you will gain horse power, not loose it. There for gas mileage going up. ACE You will also violate most if not all State and Federal emissions laws. The catalytic converter is not an option on cars, it's put there by the gov't. The only way you can remove it legally is if you are not operating it on a US highway.
The Highway Code is the UK standard for best practice when it comes to driving. It outlines all of the laws and guidelines for driving on the public highway. Breaking any rule in the Highway Code (whether a law or just a guideline) can lead to being charged with the criminal offence of driving without due care and attention. The multiple choice section of the theory test will test you on your knowledge of the Highway Code.
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