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Symptoms: Truck throws a CE light about a day after I clear the code. Code reads 'cat threshold efficiency too low'. I had the cat replaced about 40k ago. The truck passed smog after I cleared the code...LOL. I looked through the cat yesterday and its not 'blown out'. I removed the entire exhaust system from right behind cat flange, and I removed the o2 sensor as well and let it hang free. I decided to start the truck and to my amazement, and laughter, the CE light went out. I decided to drive around a bit to see if it was just a glitch in the system, but the CE light never came back on with the o2 dangling in the air. I have the 2.7L with an LC header if that helps.

So what do you think is the problem? Im going to try and replace the o2 sensor tomorrow. Thanks in advance for any help.
 
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