Ok, my CEL came back on so I was able to get the exact codes from AZ.
P1520: "Intake Manifold Runner Control circuit fault". Possible the IMRC is stuck open or a circuit malfunction?
P0430: "Catalyst System Efficiency below limit - Bank No. 2".
P0174: "System Too Lean - Bank No. 2".
I don't know what the hell those really mean. I'm looking for "real world" answers. I'm not very mechanically inclined. The car is running pretty well. Power is fairly flat above 4k rpms, but I can live with that if the repairs will be expensive. I'm just hoping to know a little bit more about what I'll "need" to get done at the garage, and what I "could" get done at the garage. Also, my gas mileage has been fine as well.
By-the-way, I did pour a bottle of Berryman's B12 in my last tank. The code came on after my next fill up.
