okie dokie, here goes....

step 1.... search....check

step 2 ... read.... check

step 3... scratch head.... check

step 4 ... new post ... under way

vehicle: 2004 scion xb rs 1.0, 20,000 miles

engine upgrades:

AEM intake, OBX underdrive pulley, DC header, 5zigen exhaust, 200 Amp Iraggi alternator, 0 guage power and ground wiring, 2nd battery


Problem: All of the following lights come on, Brake, VSC, ABS, Trac Off, Check Engine

Troubleshooting already done: Clean mass air sensor, check tail lights and gas cap, reset cpu by both fuse and ground wires (plural due to 2 batteries), head scratching

any suggestions?

 

Do you have any trustd mechanic friends?

 

yes, but he deals mostly with american brands

 

If I were in your situation I'd either take it to a dealer or to a mechanic an get the engine codes scanned to see what exactley the problem is.