hi peeps just a few little problems that i dont understand

the car was fine yesterday when i started this morning the emmisions light came on

ive done the code thing with the pedals and got 3 codes

one is

P0170 Fuel Trim Malfunction (Bank 1)

2nd one is

P0100 Mass or Volume Air Flow Circuit Malfunction

and last one is

P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

the thing is the car drives absolutly fine revs all the way up so aint in limp mode. cant understand how all 3 of these things could go wrong at same time.

any idea what they are cos i aint got a clue lol

cheers peeps