I recently installed a jdm header. The car pops the check engine light. Now the speedometer is not working along with the cars headlights and interior lights dim in and out. I wanted to know if anyone has any idea what could cause all this. Is it because of the CE light? Thanks!

 

What code is it giving you? Also, it sounds like you have some bad grounds with the lighting acting funny.

 

I got the CE light checked and got 2 codes...P-0141 & P-1298

 

P0141 Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Heater Circuit
Malfunction

P1298 Electric Load Detector (ELD) Circuit High Voltage