Where is the three-way catalytic converter located in a sedan?

[MorganLynn]

The three-way catalytic converter in a sedan is located in the first bulge of the vehicle's exhaust manifold, resembling a canteen-like device. Its working principle is: when high-temperature exhaust gases pass through the purification device, the purifying agent in the three-way catalytic converter enhances the activity of CO, HC, and NOx gases, promoting certain oxidation-reduction chemical reactions. The methods for cleaning a sedan's three-way catalytic converter are: 1. Add a cleaning agent to the fuel tank; 2. Use a hanging bottle cleaning method, where the cleaning agent is drawn into the combustion chamber through the intake vacuum suction and burned, achieving the purpose of restoring the activity of the three-way catalytic converter through oxidation-reduction reactions inside it; 3. Disassemble and clean, removing the three-way catalytic converter and soaking it in oxalic acid and toilet cleaner, then rinsing it with clean water.

[MacAugust]

I remember when I drove older cars, I often paid attention to the exhaust system. The catalytic converter is located in the middle section of that large exhaust pipe under the car, near the front wheels. I've replaced it myself a few times—it's usually positioned in the middle of the chassis, encased in a metal shell, and primarily converts harmful exhaust gases into harmless substances to reduce environmental pollution. Over time, if you notice a rotten egg smell from the tailpipe or unstable idling, it might be damaged or clogged, especially prone to rust after rainy days. I recommend checking the undercarriage for impact marks when washing the car, and occasionally driving at high speeds to clear carbon buildup. Don’t wait until the warning light comes on to fix it—safety first.

[VanessaLee]

I've worked on quite a few car models at the repair shop. The catalytic converter's position is quite fixed, generally located behind the engine exhaust manifold and at the front section of the exhaust pipe, roughly beneath the driver's feet on the chassis, protected by a heat shield. You'll need to lift the vehicle to get a clear view when working on it, and it's usually secured by bolts or welding. Once this component is damaged, the emissions test will definitely fail, and fuel consumption will increase—especially vehicles that frequently drive at low speeds are most prone to carbon buildup and blockages. The inspection method is simple: if you hear abnormal noises or detect unusual odors, address it promptly. Never neglect maintenance.

[DeAlana]

When I first started driving, I was really curious about where these things were. The catalytic converter is hidden in that metal lump in the middle of the exhaust pipe under the car, roughly between the front and rear axles. The first time I looked for it, I had to lie on the ground to see it. It's responsible for environmentally friendly catalytic treatment of exhaust gases. If it fails, not only will the car fail inspection, but it could also pollute the air. Now, I regularly have the repair shop check for corrosion or leaks.