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Summary

  • A catalytic converter looks like a cylindrical metal container with a pipe on each end, similar to a muffler, and often has a heat shield.

  • Inside, it has a honeycomb structure coated with palladium, rhodium, and platinum that react with exhaust gases.

  • It sits between the engine and muffler, with one or more units placed along the exhaust system before the muffler.

A catalytic converter often looks like a cylindrical metal container with a metal pipe sticking out of each end and will usually include a heat shield. It looks like a muffler with a pipe on both ends. 

From the inside, the catalytic converter has a honeycomb-like structure that’s coated with precious metals like palladium, rhodium, and platinum, which help convert exhaust emissions into less harmful substances. 

light off catalyst and oxidation catalyst
Typically, there will be a light-off catalyst for each bank of cylinders very near the engine and one or two secondary oxidation catalysts farther back on the exhaust system. The muffler will be after the catalyst as you follow the exhaust system toward the rear of the vehicle. These photos show both catalysts on the same four-cylinder vehicle. | Image Source: Richard McCuistian

Tips On How to Access the Catalytic Converter

The catalytic converter sits between the engine and muffler, so you’ll need to raise your vehicle to get a better view.

If you’re planning to remove your old catalytic converter, make sure that the engine has cooled down completely. Note that, in many cases, the catalytic converter is part of the exhaust system and it may be difficult to remove, so don’t get in over your head if you haven’t done a lot of wrench work.

See also  P0422: Catalyst 2 Efficiency Below Threshold (Bank 1)

Catalytic converters are often attached to the vehicle using bolts, which you can loosen with the help of penetrating oil and a trusty wrench. 

Also, make sure to remove the rear bolts first before the ones in front.

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

File Under : Exhaust System , Auto Repair , DIY Tagged With :
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