Emissions warning light?

[the stig]

My light came on today,the car is running fine but im not sure what the problem could be. Anyone got any ideas? My car is a 2004 3.2. with 26k on the clock. :confused:

[paul20v]

hi
get a diagnostic machine on it that should let you know whats up

[the stig]

Had a vagcom check and its showing 2 faults . 1 , po154 which is bank 2 sensor 1.
And the second is P0159. bank 2 sensor 2, intermitant fault.
Can anyone tell me what the colour code is for bank 2 sensor 1.?
Ive been told its either Brown or Black. and as the wires are different lengths i need to know before i can buy one? Cheers.:confused: