There are a number of common faults but the first thing to do is diagnosis. Reading the codes out will help but I suspect it won't tell you much.
The first test is to use your ears in a quiet environment, so this may not always be possible. Turn the ignition on and listen for the pump whining during priming, Lifting the back seat can help. This gives an indication that the pump isn't working. 96 on models need left for about 10s before they will prime again.
The second test is when trying to start it, and it doesn't start within the usual time (about 1s). Check if the rpm needle is moving slightly (it won't move until the normal start time). This is triggered by the coil back EMF and give a good indication of sparks.
Common faults are
Faulty pump control relay
Faulty pump (some have 2 pumps, some 1)
Faulty ignition amp
Faulty crank sensor
These can all be intermittent and start after a cooling period, randomly or with a thump.
The injector supply relay (RSR) is also common, but not detectable with the above test, but has been covered by Dave already.
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