113 Fault with 940 volvo wentworth
 

Cant find were this fault first of all it read 1.2.1 and i pulled the fuse out for fuel pump, and pushed it back in and all lights on dash were gone and the car worked fine for a day and the system read 1.1.1 but the next day the light comes back on again and read 1.1.3 and black smoke coming back out the exhurst again, but the previous two fault mas air sensor and the fuel supply in part load fixed themself as the light never came back on for them.