Breezy_Pete

Lower dash trim removal on right side should give enough access. BCM is above accelerator pedal, firewall connectors up deeper behind. The firewall connectors are a pain to access from cabin side.

BCM (onboard supply control unit in terminology of the time) at the top. Don't worry about CAN wires on the right, they're just shown for information, no need to add or touch those.

Will stick the wiring info up here in a bit, just got to do something for the next hour or so. Pin 6 of the red 11-way connector at the firewall seems to be the way through to engine ECU. Think I've got the bits to make up all the wiring somewhere.

Should be OK I think. Do you know what date it was built? I think the pin number at the firewall changed at some stage, possibly at facelift. Can look up if you know production date. BCM needs to have a part number starting 6Q0 or 6Q1, I think, which you can read off a VCDS scan if you have one?

Eventually found the locking tools that I knew I had bought, after a battle with my oh-so-tidy (not!) garage. Also a spare cam sprocket screw, so I can keep the chain kit complete. Realised that a first step logically involves attempting to correlate the error code with a measured incorrect cam angle, by just using the crank and cam locking tools, no disassembly other than removing the bits to fit those. With crank lock tool fitted and crank held turned tight up against it, I should be able to see how much of an angle the cam locking tool isn't aligned by. Only thing I wonder is whether it's best done with engine cold or at working temperature; probably the latter, I guess, but I may try both. Anyone know what the two pins are for, on the right in the box?

Did you have anything (bag etc. not a person) sitting on any of the other seats? May have triggered a false 'occupied but not wearing seatbelt' warning.

@Type17520V Just found some info about 02T's in mk2 Fabia: Looks like I was slightly wrong about your engine's power output (because I was in mk1 info before). Any of those 5 gearbox codes in the 1.4l/63 kW group should do you. LVE would be the youngest in chronological terms, but mileage probably more important.

I've used ASM a few times with no problems, based in Thame and Aylesbury, if not more places.

Yes, looking up in partslink24 for JHQ shows 02T 300 020 C as superseding it, which is indeed code LVE. Whereabouts are you? Picking up a gearbox instead of having it delivered may get you a better price.

Working backwards from the JHQ, it seems you have a 1.4 petrol with 59kW/79bhp built after November 2006. Code JFM should be a direct equivalent; fitted to same engine between May 06 and Nov 06. Not sure about later equivalents, as I'm going from mk1 Fabia info. Will see what I can look up in as sec.

My policy with repairs is to fix each evidenced problem as they become apparent. If the overall situation doesn't improve, look for the next bit of evidence. Quite often the first repair is sufficient, without it necessarily being clear why. I'm not sure that the thermostat was ever misbehaving. If the engine ECU was getting unreliable temperature info, it can't control things correctly.

It says 2.25C, I think. Which may be consistent with no flow through rad at that stage. So radiator outlet temp sensor probably OK, main engine one not so good.

Z19 is the heater within the pre-cat sensor. It gets 12V from the blue/red wire at the bottom of the diagram, ground side of it is PWM'ed by the engine ECU via the brown wire going to ECU pin 5.

I'm reasonably sure that the cap doesn't touch the baffle.

Fit cap in this orientation: Turn 90 degrees clockwise to lock down.

Pics now visible. Hopefully an owner with same engine code may be kind enough to provide a comparison photo. I can get a shot of the earlier generation equivalent in an AZQ-code HTP engine once my partner returns from wherever she's just gone to.

Annotated pic showing some PCV parts; orange rectangle contains cyclonic oil separator, pink rectangle is PCV valve. I think what you're seeing with cap not present is just a baffle to stop oil being flung continually at underside of cap when engine is running.

Your pics aren't showing. I don't think there's any part of the PCV system directly under oil filler cap.

I'm happy for you.

Just to balance some questionable assertions...

How many miles has it covered?

Try disconnecting and reconnecting the battery again, with a 2 minute pause between these actions.

Can you provide a link to an example, please?

There's quite a bit of info about the PCV system in page 2 of my thread here: https://www.briskoda.net/forums/topic/531352-petes-rescue-roomster/page/2/ Keep going until you get to the part (post on 21 June) showing the valve in the intake manifold, which is a part that will rarely be working correctly in older engines, I expect. The whole PCV system is a little complex on these engines, involving internal cast-in connectivity, external hoses and valves, and pathways and valves within the plastic oil separator box. Workshop diagrams and several photos can be found in the linked thread.

Yes, part number same as Lee says - 1K0 906 627B "Pressure converter"