Fault code p0251

Injector Fault

This DTC would be accompanied by the code P2336, P2337,

P2338 or P2339 indicating which injector is faulty. Clean or Install a new injector(s) as necessary.

P1000 is a manufacturer specific fault code:

Ford P1000: OBDII Monitor Testing Not Complete.
Jaguar P1000: Engine control module (ECM) - internal error.
Kia P1000: System diagnosis incomplete.
Land Rover P1000: Engine control module (ECM) memory erased - no codes stored.
Mazda P1000: OBDII Drive Cycle Malfunction.

So depending on the manufacturer of your car would depend on the meaning of a P1000 code!

Hello there,
Fault codes below

P0251 Injection Pump Fuel Metering Control "A"(Cam/rotor/Injector)
P12XX Fuel and Air Metering

No idea what it means but obviously fuel / fuel pump /injectors problem

Should be a ecm fuse in fuse box

You can take it to car service they can clear the codes. Or you can DIY by disconnecting both leads to the battery and touching them together, computer should reset to factory default, and reset only valid fault codes as you drive and it learns.

OBD system tests
Possible fault codes:
P1000 OBD system tests Operation not
completed
Setting of the fault code P1000 has no
influence on the system <Engine
management>, smooth running or performance
as long as it is automatically erased
whilst driving.
The fault code P1000 indicates noncompletion
of system tests.
* Misfire detection
* Evaporative emission control system
* Exhaust-gas recirculation
* Lambda sensor
* Exhaust gas catalytic converter
The fault code P1000 cannot be erased. It
is cancelled automatically once the
vehicle has completed certain driving
cycles.

P1000 is a "PASS" code, test complete no problem found.

Well, let's see... Diagnostic Test Code (DTC) P0251 is defined by SAEJ2012 as "Injection Pump Fuel Metering Control "A" (Cam/Rotor/Injector)"

I think that with that code, ESPECIALLY with an engine that will not start, the OBVIOUS next step would be to properly diagnose the injection pump fuel metering control system.
If that code is no longer there, it can only be a result of somebody clearing the computer memory...Which would be a BAD thing to do unless ALL of the freeze-frame data was recorded first. Clearing codes like that also erases the rest of the information about the fault and when it occured that a diagnosing technician needs to properly diagnose the fault. Oh, It can still be diagnosed, but the time required to do so may be multiplied several times.....It just means the bill will probably be much bigger.

DTC P1000 is only an informational code to let the technician know that there is one or more OBD readiness monitors that have not run and completed since the last time that the codes were cleared. If the codes have been cleared and the engine has not run several complete drive cycles since, that explains that one...

Fuel injection circut malfunction.
How many cylinders

P1000 means that you or someone has disconnected the battery,and the car has not been driven far / long enough for the computer to relearn its stratagies.
Engine light could be the fault of the speed sensor, or wiring to the sensor.