Gets clogged
The oxygen sensor on a 1999 Honda Civic is located on top of the catalytic converter. The catalytic converter is under the car.
How much does it cost to replace the catalytic converter on a 1999 Toyota Tacoma
I had this problem and tweaked the throttle and replaced the catalytic converter - fixed.
Yes.
The catalytic converter bolts to the exhaust manifold on the rear of the engine on a 1999 Chrysler Town and Country.
Replace it
Yes.Yes.
Not legally
Crawl under the vehicle and look between the engine and the tail pipe. You will see the catalytic converter.
You cannot unclog a converter. If it is clogged it much be replaced.
A shop can cut the bad converter out and weld a new one in.
Crawl under the car. Look for the exhaust pipe coming from the engine. The first object it flows into is the Catalytic Converter.