Bugye GX sport throwing codes - where is the Neutral Position Switch (NPS)
 

Car is throwing a a few codes.

They are:

1. p1507 Idle control system malfunction
2. p0304 cylunder 4 misfire
3. p0136 rear o2 sensor

the car is sluggish and unresponsive, but idles and drives smoothly, (i.e its fine but down on power) and has been throwing these 3 codes for a long long time. obviously, the battery has been disconnected many times, but these faults still return within a day.

so after much searching online, i found the NPS to be a strong cause of concern. so i got under the car and removed the rearmost switch from the gearbox, and filed it down and refitted - no difference - codes came straight back.

so did i have the right switch? or was i supposed to file the more frontwards one?

thanks

anyone?