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Thanks for the suggestion, I read on other threads that my problem may be related short drives that does not get the catalytic converter hot enough. I bought a bottle of CATACLEAN. Going to try this, will post the results. It may help other XLR owners.

I have 2006 XLR, and I recently encountered this code as well. P2098, we took it to the dealership, and he indicated the exhaust manifold/converter needs to be replaced, $1300. The problem is the part is on backorder with no date of availability. I will need to contact GM, my concern is that...