All well and good but the R34 doesn't have an ignitor, it's built into the coilpacks. Hence why the coilpacks always shit themselves. The CAS error would be linked to the coil packs, they're all part of the same sub-system so would be throwing wild faults, you sometimes get an error for the secondary throttle and TCS system.
Fix the packs, get splitfires and all the issues will be solved.