My girlfriends 2000 Hyundai Accent recently failed emissions and the reason given was a trouble code. The code given was (P1128: Mfg. Defined Fuel and Air Metering Code). I am not all that familiar with hyundai's could anyone tell me what this might mean.
Thanks

 

does it function with a mass air flow sensor? are there ANY mods on the car, even a K&N filter?