[Damian]

You can get cats that are OBDII compliant. They have the CARB number or whatever number stamped onto the housing. Or try eBay.

[Vettezuki]

Well, not exactly sure where to check temp in my exact case, but nowhere lower on the cat, or exiting the cat to the exhaust flange is the temprature higher than at the collector. It's the same or cooler. But that doesn't surprise me given the configuration. The collector and entry point is in front of the engine behind the radiator. The bottom/exit is probably in the air sufficiently to get cooling to the atmosphere and isn't directly mated to as much thermal mass. So it' either toast, or that test is not so relevant in the case of the Aveo.

NOTE: cat comes straight off the exhaust manifold is what I'm getting at. It's not located under the car.

[Damian]

Maybe try driving it around the block a few times and then check it. Keep it idling while you check. But if it has no power like you said it doesn't, chances are the cat is bad.

And if the cat is bad, change it out first before you change out the O2 sensors.

[Vettezuki]

Originally Posted by Damian

Maybe try driving it around the block a few times and then check it. Keep it idling while you check. But if it has no power like you said it doesn't, chances are the cat is bad.

And if the cat is bad, change it out first before you change out the O2 sensors.

After changing out the gas and plug wires, power is about where I'd expect of that little 1.6L.