Hey sorry if it’s a dumb question but I’m new to the car scene and just picked up an ‘05 g35, everything is stock expect for the sound system wheels and ecu, which the prev owner said they paid about $2k for it, the thing is the engine light is on, the car is stock so I know it’s nothing emissions based as my dad who’s an extremely experienced mechanic inspected the car and saw no faults. Great condition, so now I’m wondering if the cause of the engine light is due to the aftermarket ecu. Any helps would be appreciated!

 

Go to a local auto parts store and borrow a code reader, then scan it and see what the code is. That will tell you whats going on