Recently my CE light has been turning on and off by itself but for the last week it has remained on constant so I took the car in to have the codes pulled and I got 2 codes back......

16816 P0432 Main Catalyst Efficiency - Below Threshold (Bank 2) B

18010 P1602 Power Supply (B+) Terminal 30 - Low Voltage D

I was wondering if anybody could shed some light onto the possible problems and maybe even an apx amount on what it may cost.

I am pretty good with mechanics but ive never ran across these codes before. I havent been having any trouble with the charging system so the only thing I could think of was just a voltage problem from the battery.....I also recently installed a couple of subs in the car so I was thinking that could have caused a drop in available voltage.....Oh and Im not really sure if it matters but I drive a 99 A6 quattro w/just under 130,000 and this is the first problem I have ever came across with the car

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