I have 2.0L Turbocharged IWSTi JDM Spec. I have some problems here, i hope you guys can help me. The problems which what i means is when i driving around 120 km/h the engine light suddenly pop outs. I checked with OBDII tools got 2 CEL codes appears on screen. A codes was given is P0031 Front oxygen (Air:fuel) sensor heater circuit low input and P0037 Rear oxygen sensor heater circuit malfunction and then I replaced with a new O2 sensor (front and rear). However after i driving few miles the engine lights pop outs again and sometimes it disappear but when IDLE the engine light not pop outs. I checked again with OBDII tools and no CEL codes error was given. I also checked all my wiring, sensor, fuse, and gas cap no problems at all. Anyone please help me how to solve my problems. TQ 