Hi folks I'm a newbie with a nissan 350z 2005 roadster, getting these codes from the OBD computer. I've reviewed some information about the codes and also some other information from the threads here but have not come to a good resolution for these.

I also have a feeling that it's consuming more gas than it should, trip computer is showing around 11 mph, just want to confirm the code p0430 could be the reason for this? I don't really think the other code p1273 could be affecting it.

I purchased it from an auction sales so going to the dealer is not an option and want to take a good advice before getting ripped off by taking it somwhere to check.