Question

2003 Land Rover Discovery, how to fix the P1551 and P1510 codes?

Answer 1

ITS an ETS system code   basically Your Timing system

So you have high voltage in system....short or open wire.... bad connector.green or loose

Ohem test wires check connectors between system components

Crank sensor.> ICM>cam sensor.....Check what your system has for components.

Also test components if you can scan tool or volt/ohm meter

NOTE if you have a security key or system check it out also