Volume control on reverse (backup sensor). My volume on the backup sensor when in reverse has almost went silent when backing up. Is there a way to adjust the volume?

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Ian, P0001 fuel volume regulator control circuit/open, may be an electrical problem related to the fuel volume regulator. clear the code and see if it comes back
P0051 Oxygen sensor heater control circuit low, bank 2, sensor 1.
Normally a bad wire/plug on sensor or sensor faulty.
Check the attached links,instruction and guides to explain codes in more detail. Good luck
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http://www.obd-codes.com/p0051
http://www.obd-codes.com/p0001
P0001 OBD II Trouble Code Fuel Volume Regulator Control Circuit Open

Does your stereo have a manual volume adjustment knob? If so, then try twiddling it quickly from side to side. If this helps, then it could be a poor volume control issue. Try having this professionally cleaned or repaired. If not this issue, then also try removing the stereo and checking the wire connections on the back of it to the speakers. I'm assuming that all the speakers are failing to project sound when the fault occurs, so we are talking power issue here. The fault is most likely part of the stereo head unit.

P0406 FORD - Exhaust Gas Recirculation Sensor 'A' Circuit High

Possible causes- EGR volume control solenoid valve harness is open or shorted
- EGR volume control solenoid valve circuit poor electrical connection
- EGR volume control solenoid valve
- EGR temperature sensor and circuit

P0403 - Exhaust Gas Recirculation Circuit Malfunction

Causes for DTC P0403:
- Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control solenoid valve
- EGR temperature sensor and circuit

Solutions for DTC P0403:
- Repair EGR harness or connector
- Replace EGR volume control solenoid valve
- Replace EGR volume control valve


P1784 - Transmission Mechanical Failure (First and Reverse)

Causes for DTC P1784:
- Not waiting to allow transmission to engage gear before accelerating.
- Dirty fluid / clogged transmission filter

Solutions for DTC P1784:
- Allow gears to engage before acceleration
- Preform transmission service (flush & filter)

Hi
It sounds like it would more than likely be a short from some where within the wires probably a speaker wire try turning the radio of then on whilst the ignition is on. Then turn the radio back up again.
Regards Craig

you have many problems in one question.
Let's start with
1. BACK UP Warning is it the backup lights not working.
2. When you open the driver's door does the inside lights turn on
maybe the system doesn't know the door is open or the little switch inside the steering column is open circuit.
3. Maybe the speaker itself defects or wiring touching metal ground
many questions that I cannot answer without more infos
hope it helps

P0401- Exhaust Gas Recirculation Flow Insufficient Dectected
Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks Possible solution - Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve
Code P0171- Fuel Injection System Too Lean Bank 1 Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem P0174- Fuel Injection System Too Lean Bank 2 Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.

have a look for the rev sensor box it controls the volume and sound it may have packed up its a black plastic box connected to the sensors you need to find its location to find out

yes there is you need to locate the unit,usually fitted in the rear trim near tail light just have to look for it,put it in reverse with the key on to hear it,theres a vol control on the unit to adjust the volume