The initial change cleans out the catalytic converter, but a permanent switch could maintain it for the life of your vehicle.
Consider switching to high-octane fuel, at least periodically, if you find that changing to high-octane fuel fixes your catalytic converter problem. In open loop, the engine may run too rich or too lean, which can be damaging to the catalytic converter. If the MIL illuminates, it's likely that the engine is running in open loop, based on programming and not feedback. Address the check engine light promptly. If you or your technician see anything that needs care, address it right away to prevent possible damage to the catalytic converter. Keep up with regularly scheduled maintenance, like oil changes, air filter changes, and regular inspections. To reach proper operating temperature, spend at least 20 minutes driving at highway speeds once a week. Because it filters exhaust and emissions, it doesnt really impact your vehicles actual driving capabilities. Don't let your car sit for weeks without being driven, and make sure you take a few long drives rather than only short trips. The good news is, your car will run just fine without a catalytic converter. If you have to replace your catalytic converter, make sure it lasts as long as possible with these tips. Sometimes, the catalytic converter absolutely needs to be replaced (like if it's broken internally or melted down). As you can see, the cost of replacing a catalytic converter varies a lot, which is why it’s always a good idea to ask for quotes before you settle on a mechanic to do the job. Make Your Catalytic Converter Last Longer The labor price for replacing a catalytic converter at the reputable auto center can be anywhere from 60 to 130 per hour of work. If the engine control module (ECM) detects a catalytic converter problem, it might record DTC P0420, defined as “Catalyst System Efficiency Below Threshold.” HOW TO INSTALL CATALYTIC CONVERTER WITHOUT WELDING CODE
An illuminated check engine light or malfunction indicator lamp (CEL or MIL) with a catalytic converter diagnostic trouble code (DTC) is the most common catalytic converter problem indicator. Failing the annual or semi-annual emissions test might also be linked to a failed catalytic converter.A rattling noise when starting the engine might indicate a broken catalyst.If the catalytic converter's housing is discolored or warped, there may be internal leakage or overheating.
Ammonia (NH 3) odor may also indicate poor catalyst function.
A sulfur or "rotten egg" smell indicates the formation of hydrogen sulfide (H 2S), a likely sign of catalytic converter contamination. 
A clogged catalytic converter essentially "suffocates" the engine, preventing it from "exhaling" the exhaust. These issues could indicate a clogged catalytic converter, restricting the flow of exhaust out of the engine. Engine accelerates poorly or is hard to start.
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