jensenjk

Ok, so I've been getting engine misfires on all 8 cylinders (p0300-p0308) about every 2 weeks for the last 6 weeks. The CEL comes on in all kinds of driving conditions whether I'm in town or on the freeway. Along with those p0300 codes comes the p1602 which is the low voltage to power supply terminal. I'm wondering if these two are related? I have new injectors all around on 145,000 miles, new fuel filter, OLD original battery. The car is a 1998 A8, so I'm guessing the battery is going downhill and I need to replace it.

In other parts, I'm also getting the 01200, abs valves supply voltage error, and I really couldn't find anything definitive on it. Any chance this code is related to the cruise control issue I'm having?

Finally, I'm having intermittent cruise control issues. I replaced the left turn signal switch with a brand new one last week and my trouble continues. The e-box is dry even after it rains or after washing. My next step is to purchase a used computer for the cruise since when the cruise is working it works perfectly. This leads me to believe the pumps and vaccuum lines are in proper condition. I don't think this is an F125 switch problem since all of the rest of my electronics are working that are normally associated with that.

Any suggestions?