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Suzuki swift HT51s 2004 catalytic convertor



1. There is a "tik tik" noise coming from exhaust line after every drive. Technicians say that noise is from catalytic convertor and there is nothing to worry about.

2. Recently the O2 sensor malfunctioned  and the technician had the doubt that failure of O2 sensor may be due to blockage of exhaust line and cleaning of exhaust line will bring back the  O2 sensor to working condition. Anyway I have replaced the O2 sensor....

My problems are

1. Is the sound "tik ik" from exhaust is ok???

2. Is is necessary to clean the exhaust of older cars (more than 90,000km) cause the car can overheat? If yes how?

Thank you.............

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1. The ticking noise is the exhaust cooling down. This is normal. 

2. No. The exhaust is not a component that requires maintenance or cleaning. With proper maintenance of the car, there should be no blocks in the exhaust system. 

Also, it's unlikely that the Oxygen sensor failed due to an exhaust block. Sensors failing just happen due to various reasons including age, excessive temperature, carbon deposits etc. 

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