Breezy_Pete

Post a photo of the label.

Does the engine use any oil? Oily soot seems much more likely to 'lodge' along the EGR pathways than drier soot.

For anyone that keeps brim-to-brim mpg records, any difference in economy should become apparent reasonably rapidly. I'll be looking out for it on our Fabia.

@langers2k I wasn't considering trying to measure anything with LED lighting, just the halogen set up that Skomaz has. Is there someone nearby with VCDS maybe? Thinking about it, it might be interesting to measure it even without having any way of trying to change it, to see how it does compare to the voltages reported in that other thread. Things may get very confusing though, as the system voltage in recent cars must fluctuate around a lot with the variation in alternator voltage setpoint due to the micro hybrid malarkey. I wonder if the PWMs of systems get dynamically tuned to compensate for these effects?

I would have thought the voltage (as measured with a multimeter) at the bulb would be adequate to see if anything changes?

If you have a PWM power supply to the bulb, the mean voltage seen by the bulb can be varied between 0 and 100% of the incoming supply. What's being suggested is that the factory default setting isn't 100%. 'Value' 100 (or 127) as shown in that other thread does not necessarily mean percentage of system voltage, except perhaps if you interpret it as 'percentage of factory default setting'.

I don't have any wiring diagrams for Kodiaq, but I wouldn't be surprised if most of the lighting was powered by solid-state stuff, in which case it may well be configurable/controllable as suggested in that link.

No @mrgf, just the one pressure sensor (in the high side), no pressure switches. The HVAC module uses the sensor readings to know what's going on and also to control the radiator fans.

Don't know the answer to either, sorry. Are the things in your first photo, on the back of the unit, plastic pegs that might pull out, or are they melted over?

Is that cover with the part number sticker integrated with the connectors, or are they separable? Might be some 'ramp catches' between connector bodies and lid, as well as down the edges, so the other cover stays attached to the board, but that cover comes away? There are a couple of holes that might have screws down them, visible in that shot too.

Sorry, no idea how it might come apart. Might be designed not to without breakage if you're unlucky.

Possibly; the indicators will be powered by a chip inside it, no relays involved I believe. Can you remove the BCM and inspect its innards for any signs of damage?

You heard some nonsense there. Nothing to do other than extract old, fit new. Careful not to break connector latches.

That may just be the only/real problem. Make sure you find that current drain if you can measure one, otherwise any battery you fit is going to have its effectiveness and lifetime badly compromised. Quick and dirty parasitic current measurement - Handy Topics & Guides - BRISKODA

Ignition switch? If the starter works well when the solenoid is given direct power from the battery, and in the recent past there has been a short-circuit drawing excessive current through the ignition switch contacts...

Earth connection fault certainly possible and easier to mend.

It's a sensor, not a switch, but yes, there's a valve under it.

It may be that a device inside the BCM connected to the starter solenoid is damaged; this damage may have started when that diode failed. I seem to remember thinking that the diode's probable function was protection for just such a device.

Monitor temperatures displayed in measuring blocks while disconnecting sensors one by one. When the reading for sensor 3 changes, you've found the correct one?

The problem with replacing the evaporator is that it is deep within/behind the dashboard. So labour costs will be a high proportion of the overall bill.

Suffix E was replaced by suffix F on 1st Feb 2009 Buy 036905715E ignition coil withspark plug connector Audi, Seat, Skoda, Volkswagen genuine OEM part (oemwolf.com)

I'm not convinced, but if you want to chuck bits at it, your engine code is BME, view the links on a computer not a phone to see all the columns: Coil 036 905 715F ignition lead; spark plug; ignition transformer; g... - Fabia(FAB) [EUROPA 2007 year] (7zap.com) Cam sensor 030 907 601E, crank sensor 03D906433, engine control unit; lambda probe; knock sensor; i... - Fabia(FAB) [EUROPA 2007 year] (7zap.com)

Well there's another diagram for cars built before that date, which probably has different versions of bits in it: camshaft timing chain; timing case; D ... - Yeti(YET) [EUROPA 2013 year] (7zap.com)

You're well into @langers2k territory with that last screengrab, I have no idea about long coding.

Chain: camshaft timing chain; timing case; D - 24.10.2011... - Yeti(YET) [EUROPA 2013 year] (7zap.com)