[WarrenandZoe]

As above, I have a front end knock, on startup and over bumps, checked wishbones, trackrod ends, springs and all seem ok, also have intermittent heavy steering especially at low speed i.e when parking, have had RAC out and has found following codes,

Diagnostic Codes
RAC DIAGNOSTIC SYSTEM
System Type: ENGINE SYSTEM TEST/VALUES
Name: D5244T - EDC 15C11 - 2.4L - 120 (163)
DTC: 6805,Boost pressure regulation, incorrect flow
System Type: BRAKES
Name: ABS (BCM) - MARK 25
DTC: 0032,Wheel sensor LR, faulty signal
DTC: 0106,Faulty steering wheel or wheelsetting
DTC: A032,Stability function, too long stability regulation
DTC: A031,Communication, CAN bus
System Type: IMMOBILISER
Name: IMMOBILISER - DIAGNOSE (CEM)
DTC: 8F43,Relay, rear washer motor. Too low signal
DTC: 6C48,Transponder type, signal incorrect
System Type: SOUND SYSTEM
Name: AUDIO - AUD (AUDIO MODULE) (AUD)
DTC: 0003,Loudspeaker right front, signal missing
System Type: SOUND SYSTEM
Name: INFOTAINMENT - INFOTAINMENT MODULE (ICM) (ICM)
DTC: 1A57,Communication with phone module (PHM), signal missing
DTC: 1A52,Communication with antenna module (ATM), signal missing
DTC: 6C71,Audio module (AUD) not valid, incorrect signal
DTC: 1F20,Left keypad, activated too long
DTC: 1A51,Communication with audio module (AUD), signal missing
System Type: AUXILIARY HEATING
Name: ADDITIONAL HEATER - CPM (COMBUSTION HEATER)
DTC: 0,No trouble codes stored in the system
System Type: CENTRAL ELECTRONIC UNIT
Name: CENTRAL ELECTRONICS - CENTRAL ELECTRONICS (CEM)
DTC: 8F43,Relay, rear washer motor. Too low signal
DTC: 6C48,Transponder type, signal incorrect
System Type: CENTRAL ELECTRONIC UNIT
Name: REAR ELECTRONICS - REM (REAR ELECTRONIC MODULE) (REM)
DTC: 4F45,Parking assistance sensor 4
System Type: CENTRAL ELECTRONIC UNIT
Name: UPPER ELECTRONICS - UEM (UPPER ELECTRONIC MODULE) (UEM)
DTC: 0004,Siren, communication fault
DTC: 0083,Rain sensor, internal fault
System Type: AC SYSTEM
Name: CLIMATE CONTROL - CLIMATE CONTROL (CCM)
DTC: 0021,Air quality sensor, internal fault
DTC: 0019,Function button, activated too long
System Type: STEERING WHEEL ELECTRONICS
Name: STEERING WHEEL ELECTRONICS - SWM (STEERING WHEEL MODULE) (SWM)
DTC: 0003,High beam flash, activated too long
DTC: 001B,Carphone YES b

All have been erased except permanent ones - reverse sensor, air quality sensor and alarm ( not fussed about) does anybody have any idea what could be causing the noise? It happens when braking as well