Breezy_Pete

Will check for you once I've finished my porridge.

Reg plate or VIN needed.

As far as I know, the only number that needs matching is the 6Q1937049D. I doubt any of the others tell much/anything about the soft coding.

@MijIsTired I wonder if @xman was referring to the oil separator, item 23 here https://www.lllparts.co.uk/catalogs/skoda/CZ/FAB/697/1/103/103007 when he talked of the PCV valve?

Yeah, I think it supplies all the backlighting.

There's some electronics in there that fails sometimes. Grab a spare from a scrapyard to try.

Driver's side wire breaks tend to be more common simply because that door is used every time the car is driven. Other doors' usage levels - and so wear tear on their wiring - will vary with usage patterns. Could well have breaks both sides though.

Nice one.

Check driver's side wiring, I think you may find a relavant broken wire or two there.

This one's a bit cheaper, for some reason, still Croatia: https://www.ebay.co.uk/itm/256436815637

I posted this link, but then noticed where it was coming from and the near-£60 total price including delivery. https://www.ebay.co.uk/itm/256436832151 Just measure the end fittings it goes onto and get a bit of standard hose the right size. Then arrange the length so it goes round the bend without kinking. Looks like it's same diameter both ends which makes it easier.

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6Y0121049D, probably. Part numbers are usually printed along the hoses, somewhere.

Far more likely to be a wire or connection fault.

I've found youtube videos for mk3 Fabia And Mk1: But not Mk2, yet. when you find them, please post photos and instructions of how to see/access.

Power to heaters of both oxygen sensors are the blue/red wires, originating at cabin fuse 9. Control is via the brown wire for precat sensor, and the brown/white for the post cat sensor. They go to engine ECU pin numbers 5 and 63 respectively.

Relays are further inboard. You have to take off the lower dashboard trim beneath the steering wheel to see, I think. There's a guide for another job on a Mk1 that includes instructions for removing that trim panel, here. not sure how similar it is on a mk2: You'll see the relay panel once that trim is removed.

Loud, smoky cars are antisocial, not cool.

None of the errors with E313, G85, or J492 seem to relate to any of the soft coding options in module 09, so I think these must relate to another control unit having its coding corrupted.

The coding structure for onboard supply control unit/ module 9 is as shown in this image. The derivation of the code for my partner's 2005 car is shown in red. Pick the options that apply to your car, add them all up, and try that.

Every hose connected to the intake manifold is a vacuum hose. Anything that isn't, isn't. So the PCV outlet hose, the EVAP purge valve outlet hose, the brake servo hose and the steel EGR outlet hose are all vacuum hoses, effectively. The ones connected to the air filter are just sources of clean, filtered air to EGR valve and valve cover.

Message me with reg number or VIN tomorrow, please.

One way valve is part of the servo vacuum hose, near the engine end of it. With engine cover off, it should be easy to see the entire hose end to end. Very unlikely that the fuel system has anything to do with the misfire. You may need some help from a garage?

Did you try driving the car during any of this testing? Sometimes you just need to start up and set off down the road before these systems reset themselves after a fault is rectified.