Thanks for the guidance on this. The Pontiac shop took off the exhaust manifold and showed it to me (only had to ask three times). Turns out the manifold has some sort of ceramic or metal liner and that is what caved in. The Pontiac shop seemed confused about it. When I talked about it with the Auto...

Thanks for the advise. The pontiac garage has also been no help at finding a replacement (month delivery?) A junkyard option appears more likely. Is this what you always get when you trust the professionals instead of doing it yourself?

I also have a 2003 (manual) with the check engine light on. Autozone pulled a P-0135 code which is the front o2 sensor. I have had problems getting it fixed as I tried to do it myself for $100 and there is a chunk of metal in the hole. I stopped at two different autozones and they both told me the s...

Check engine light came on at 100,200 miles. Not a single problem before this. Autozone said front o2 sensor. Bought one for $100. Pulled the nold one out at home. Somewhat difficult because there appears to be a chunk of metal lodged against the sensor. Took it to the Pontiac dealer. They say $850 ...