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.
Yes.Yes.
Not legally
Replace it
Crawl under the vehicle and look between the engine and the tail pipe. You will see the catalytic converter.
A shop can cut the bad converter out and weld a new one in.
You cannot unclog a converter. If it is clogged it much be replaced.
Crawl under the car. Look for the exhaust pipe coming from the engine. The first object it flows into is the Catalytic Converter.