No, it's a huge difference between the two.
The exhaust valve is a kinda mushroom shaped thing that sits in the cylinder head. It's closed to retain the force from the burning fuel, then opened to let the burned fumes out, then closed again for the next round.
The catalytic converter looks like a small muffler and is a part of the exhaust, bolted on in-line fairly close to the engine. Inside there's a honeycomb structure that the exhaust flows through. A special material - platinum - reacts with the exhaust to make it a little bit less polluting before it gets into the atmosphere.
Under the vehicle bolted to the exhaust pipe.
== == 1996 Corolla's have two oxygen sensors. The first sensor, is pre catalytic converter. It is located on the exhaust manifold. The second sensor is post catalytic converter.
Check the heat shield on the catalytic converter
the sensor is located in the exhaust, downstream front the catalytic converter. the connector for the sensor in under the carpet on the passenger front floor near the center dash area.
its long gone now, lets put it that way.
It could be your catalytic converter... yes, catalytic converters clog on these often. its fairly easy to unbolt it from the exhaust manifold. if you take it off, shine a flashlight up from the bottom, you should be able to see light from the top.
Under the vehicle attached to the exhaust pipe between the engine and the muffler.
A/F sensor are located in each exhaust manifold, O2 sensor After catalytic converter on exhaust pipe
There are 3 oxygen sensors; one in the front exhaust manifold, one in the rear exhaust manifold, one AFTER the catalytic converter. The 2 exhaust manifold sensors are the same BUT the catalytic converter one is different. Also, the 2 exhaust manifold sensors have heaters in them, while the converter one doesn't.
There are two of them, one on either side of the catalytic converter in the exhaust system.
What about it?
How much does it cost to replace the catalytic converter on a 1999 Toyota Tacoma