fault codes ???

[1.8t.jim]

got 2 fault codes showing up on my code reader
16514
16486
the car shudders when idling and nearlly cuts out, and exhaust stinks of petrol, sounds rough also, anybody help me with this and tell me what sensors have failed and need changing
my car is a mk4 AGU 1.8t

[barrym381]

16514 - Oxygen (Lambda) Sensor B1 S1 fault code
 http://wiki.ross-tech.com/wiki/index.php/16486/P0102/000258

[1.8t.jim]

thanks mate oredered a new MAF and lambda !