This past week my truck started making a strang rattle from the exhaust. I figured it was my muffler since it is original pushing 140,000 miles. Took a look at it today and found that the co2 sensor after the cat had lost its nuts and was just bouncing around. I was able to lift it right out of place!!!! But I find it wierd that my check engine light never came on. I think I have felt a little power lose lately but nothing big. Would this cause my truck to run bad? Should the check engine light of came on? Should I replace this sensor?Any input would be grateful.