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My issue was the HP pump and relief valve and yes it was a PITA to change. I refurbed mine which failed and then had to get a recon one so changed it twice.

There appears to be 2 sensors, HP and LP.

good point :)

But he doesn't know. It's been diagnosed as a pressure sensor issue

Yes he needs diags, my relatively cheap Foxwell does it

Surely plugging diags in to read pressures is the first and easiest step

You don't need the code you need to check what the pressures actually are

You need to check the fuel pressure to at least rule it out. Diags can read them.

If the HP regulator has gone faulty it will cause low pressure so may show as a sensor fault.

Did the diags give the fuel pressures low/high? HP regulator is a know common issue, ask me how I know. EDIT: I don't remember seeing any fault codes.

Perhaps a left handed one.

Even if you get the code how can you enter it. I thought you could turn the EKA code off with diags

Whats the voltage with engine off? If it's low on startup the ECU may not boot up properly.

How good is the battery? Had similar issue where car would start but not rev due to low volts on the ECU at start up.

OP's other posts were for a L322 MY2002. Mines had a few batteries but never asked for a code. Don't see how radio code would stop it starting.

Mine would also be dead after 40 days without a charge.

No you won't.

Was it a recon gearbox or just another used one with 80k on it?

How many miles has it done? around 100k is generally rebuild time. If there was no oil I doubt it would have moved at all as the gearbox and torque converter (clutch) share the same oil.