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My Vios cars catalytic converter is bugging me for several months now. Scanners says catalytic converter below efficiency. I talk with couple of mechanics and some say iI need to change the O2 sensor, and some says i need to replace the catalytic converter which happens to be the three quarter of the exhaust pipe. cost of the genuine part is nearly 1 Lahk. Does any one know what needs to be done, Can i clean it without replacing ? I can go for a second hand part which will cost me about 20K but no guarantee.

Hi Guys, I owned a Civic Ek3 96 JDM which comes with a Catalytic Converter. Now it's indicator in meter panel is randomly turned on and off. It seems it comes on if I drive the car in high RPMs, and I noted that the engine is rev hard but car is not moving much and ignition sound also hearing. Once the light comes on again it goes off if I drive the car smoothly in low RPMs in about 10-15min. This is happening now quite a some time. And most of the time after having a drive in high RPMs, next day morning once I turned on the ignition switch, Catalytic converter indicator and Battery indicator don't turned on no matter how many times i turned off and on the ignition switch. But the car starts as normal, then for next time all the bulbs are turned on as normal for whole day. And other thing I noticed was if the car is drove in high RMPs, lets say two three days continuously, engine oil level is dropping in considerable amount. (suspect bad valve oil seals, if so how to get it confirmed that before opening engine?) Before going to do anything thought to get ideas of you guys. How to check the condition of catalytic converter? If it is bad is it available to replace and cost and where can i find it? If it is not available to replace, is it ok to remove it? What are the pros and cons of not having a catalytic converter? Many Thanks,