Is it necessary to replace the catalytic converter with an original one?
3 Answers
If it is damaged, it needs to be replaced; if it is only clogged, replacement is not necessary. Additional information about the catalytic converter is as follows: 1. Function: It refers to the catalyst that converts harmful gases such as CO, HC, and NOx emitted from vehicle exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction. 2. Substrate: The substrate component of the catalytic converter is a porous ceramic material installed in a specially designed exhaust pipe. It is called a substrate because it does not participate in the catalytic reaction itself but is coated with a layer of precious metals such as platinum, rhodium, palladium, and rare earth coatings. It is the most important external purification device installed in the vehicle's exhaust system.
I have some experience to share about replacing the catalytic converter. Last time my car failed the emissions test, the repair shop insisted on using an OEM part, quoting over 5,000 RMB which shocked me. After some research, I found that aftermarket brands with OEM certification perform just as well. The key is to check if the ceramic substrate density and platinum/palladium/rhodium content meet standards. Mine has been working fine for over two years and still passes inspections. However, I wouldn't recommend taking chances with China VI vehicles - their sensors are too sensitive and prone to throwing fault codes. The money saved is better spent on a quality oxygen sensor. I actually used the savings from the catalytic converter replacement to buy new tires, and the road noise decreased noticeably.
There's really no need to blindly trust genuine parts. In my 10 years of auto repair, I've seen countless cases where aftermarket big brands like Bosch/Mahle showed tailpipe emissions data differing less than 5% from OEM. What really matters is proper installation - uneven gasket seating or overtightened exhaust hangers can cause leaks. Recently serviced an old Camry with aftermarket parts, saved the customer 3,800 yuan. Important reminder: always road test after replacement - maintain 2,500 rpm for 10 minutes to heat catalytic converters to 400°C for proper activation. Before emissions test, drive at highway speeds - cold-start testing often yields unfavorable results.
