Lost of presure on my 05 impala

To be sure on whats going on the vehicle should be scanned for any trouble codes. The catalytic converter could be plugged, and if you lost the exhaust from the cat on back, you may have lost a O2 sensor. The exhaust definitely is in need of repair to correct some of the problems you are having.

Ok so what about the bogging down at40 and check engine light blinking and then losing power til i feather the pettal until light goes soild does that mean a sensor is bad or would the 02 sensor make it sputter like that. My tail pipe was creaked at cat and my bro touched it bearly and it pushed the pipe up less then and inch and the sputtering stoppes and ran great and the next day whole igsost fell off on a gravel road and it flashed a few times then ran good for couple days until it was storming and i hit a puddel and the blinking and sputtering started again. Do u think this could just be 02 sensor ? And can u tell me were it sets on cat plz?

You can check the catalytic converter by just running the car for a while, then pulling off in a dark area with the engine still running and look to see if the cat is glowing orange or even a tint of orange. This would indicate a plugged catalytic converter. This does hold the engine back, makes it bog down. And it is more than just a O2 sensor causing your problems. The exhaust needs to be in-tacked for the engine to be able to perform properly. One of the O2 sensors is back past the cat somewhere in the exhaust. Look for any dangling wires around where the exhaust pipes go.

Thank u that makes since . And ill try that and see what how it acts and if i have any more questions ill try to contact u again

I'll be here, see what you find.

Help with my 2003 impala anyone ?