So I had new tires put on last Saturday and while it was up on the lift I asked the guy if I could take a look to try and find out where the rattle was coming from.

We cranked it up and tap the pipe a few times and it appears to be coming directly from the pipe that leaves the engine. There is a bulbous thing there before I think it goes to the resonator. Is that the catalytic converter? Because that is definitely where the sound seemed to come from.

If so, that would be covered by the 8 year/80,000 mile thing, right?

 

I have a pic in my gallery of a catalytic converter for an hhr. compare the pic to what you see on your car.

 

I assume you mean this


I guess the first part doesn't have anything that can rattle right? the second part looks similar to what was making the noise.

 

yep thats the catalytic converter ant it is covered under the 8/80 warranty. the factory convertor comes with all that you see in the pic.

 

Just picked the car up from the dealer. Sure thing, it is the cat converter making the noise. Bad news...they are on backorder so I will have to take the car back in when the part arrives

I think the service department hates it when you call and tell them what the problem is before they even know. The guy was like..well bring it in and we will check it out and if it is the cat then we will take care of it, if that's it.

While I was standing there the service guy was ordering end links for someone and was making the comment about getting rid of the clunking noise

 

Free is worth waiting for

 

Well, it took less than a week for Brown & Brown Chevrolet to call me and say that my CAT had come in. I took the car in the next day not only did they fix it under warranty, they gave me the option of a free oil change or a $25 gas card! I took the card as I do my own oil changes and use Mobil 1 full synthetic oil. After leaving the dealership with a much quieter HHR I headed over to Power Chevrolet with the B&B receipt in hand. Found the service manager and asked for the $52.88 back that they charged me for mis-diagnosis. He went to his manager and came back and told me they would mail me a check. Two weeks later I received the check in the mail. I guess we all know where I'll be taking my HHR if it needs anything from the dealer!

 

Good for you man!


I am still waiting for the dealer to get mine. Its been about 5 or 6 days now, so hopefully they will get it next week.

 

I have been looking for possible reasons for an exhaust rattle. I have seen replies where people have turned off the 02s. Can anyone tell me what an o2 is?

 

02 is the oxygen sensor...