I have a D15b2 that is throwing a code 1. I have replaced the o2 sensor and am still getting a code 1 I have reset the ecu not sure what to do. The car also stutters a little maybe timing is an issue? I have also installed a lightweight flywheel and a stage 1 clutch. I'm so confused. Someone told me to check my igniter that it may be causing problems for me. Because I also lost my tach signal in my aftermarket tach. I'm not sure if its just blown though. I'm getting a headache.