do you have hondatas200 and your car wont go past 4k but runs fine else wise? I had this problem, and it was all because of a wire inside the connector to connect to the s200 box not making a good contact and basiclly not initializing and causing the car to run in limp mode. so if you have this problem, check the 4 wire harness that runs from your ecu to your s200 and save youself a headache. I hope this works for someone.