please help

1999 v5 uk turbo
95k

The only mod is cat back exhaust (blowing from centre pipe)

I've noticed it hesitating on acceleration.

up to now I have

run engine to temp and unplugged maf( car stalled)
cleaned boost solenoid( used scoobypedia how to) solenoid clicks rapidly when green plugs are joined.
read fault codes they are
22 Knock sensor
33 o2 sensor
45
ABS light is on also I assume thats where code 45 comes from

any advice please??

 

anyone?

 

02 sensor and knock sensor could both cause hesitation. Really need to run it and see what faults come back or get the car data logged to work out whats going on

 

Thanks its sorted now. It was the fuel pump