Hi All, 

 

Owner of a 65 plate 150bhp TSI, had numerous issues since acquiring it, one of which is the 'P00900 - Fuel Pressure Regulator "A" Control Circuit/Open Intermittent' fault which keeps reoccurring. I've returned it to the garage several times who have suggested they have replaced looms and fuses but this keeps coming up as an 'intermittent' fault on OBDeleven which doesn't necessarily flash up the EML light everytime, more a 'stored' fault code within the ECU. 

 

Symptoms- Can feel on occasions a slight misfire of the engine, engine start stop errors, EPC light flashes on tapping of the throttle intermittently but no solid light. On shutting down and restart of the car after a period the EML comes on solid, on rescan, fault is still there. Power loss is intermittent, hard throttle sometimes can be achieved, sometimes it's very hesitant and doesn't apply any boost at all. 

 

Inspection- Unsure where the fuel pressure regulator is located on the engine bay to test correct voltage, hopefully someone can help with that. On inspection of the engine bay fuse compartment, I appear to be missing fuses 5 ('coil of the relay for the ignition system, coil of the Cng relay, engine components') and fuse 16 (ignition, fuel pump) not there (I'd have thought I'd not be able to start the car without this particular one). I've attached a picture for reference. 

 

Thanks in advance. 

It doesn't look as there are any pins for a fuse there. Have you had a closer look?

Just now, Blue8793841 said:

It doesn't look as there are any pins for a fuse there. Have you had a closer look?

 

Yeah, only realised that when I posted it 😅 everyone is where it should be seemingly. Any ideas where the fuel regulator may be? 

I'd start by checking all fuses are tight just give them a push/wiggle. Check the wiring and pins on the sensors and multiplugs for damage or any corrosion. Looks for any damaged earth wires on the vehicle body.

Hi @Fwb1408 - did you manage to resolve this issue? I'm having the same issues as described by you above, mainly on cold starts, on my 1.0 eTSI.