J.R.

OBDII devices only read generic OBD fault codes which are common across all manufacturers, the code will be generic if the second digit after the first letter symbol is 0, these are mainly concerned with emissions and safety systems. VCDS (and others) unlike OBDII can communicate with all the Canbus modules and read all of the manufacturer and vehicle/engine specific codes stored within unseen by OBDII readers, it can do far more than that but that is beyond the scope of your question. Which VCDS is

I was going to suggest you might like watching this guys Youtube channel, its a garage that seem to specialise in the diagnosis of car electrical problems, I have learned a lot from them, the 2 characters might grate a little, they are a bit 'deese dem and doze" and make a horlicks of the past tense but the boss man really knows his stuff and explains the process really well using the wiring diagrams on a large screen. I just looked to find a link and lo and behold this video includes a Polo with a wiper problem amongst others: I watched another of his recently when he was teaching the apprentice the logical steps to go through with a non starting diesel engine when you have no information to go on (car bought non running from an auction) I learned a hell of a lot especially regarding cranking airflow through a broken EGR, it was like being a fly on the wall while someone else was being taught.

I have read through the first of the links and refreshed my memory, I have no recollection of that it maybe it was the post surgery painkillers. Not Canbus, not Linbus they give commands to the rear motor but we dont at present know how, as you say the motor only needs a start signal (removed to stop after self park) the other could be intermittent as I think it is a fixed delay and does not vary according to how the front delay is set. If I dont forget I will look at the gateway installation list next time I use VCDS but from what you have said and the diagram I dont think I am going to find a can node for the rear wiper other than in my imagination. My apologies for not recalling the learning that you gave me in the past, I had very strong painkillers last April time (I cant even recall the date!) when I broke my back and I have a memory blank of several weeks, my diary and bank statements show that I returned to Picardie during the recovery period but I have absolutely no recollection of the visit. Aha!!!! its fallen into place now, I was hospitalised with Cellulitus Orbitale shortly after the 2023 cataract surgery (mentioned in the first thread) it was like Sepsis but even worse, I was away with the fairies for a week or so in the hospital (and also blind) and would have been on very strong painkillers afterwards when I was not allowed home but had to stay with friends.

Channels vary according to the model and engine type, no point in quoting a number, also the descriptions change often akin to a cryptic crossword puzzle clue. Looking through the thousands of channels which only present a few at a time in a miniscule text box I can find a dozen if not more for the same parameter with varying descriptions, only one of which will have data for my vehicle the others bring up nothing. Same deal with quoting values, they units change and often the data will not even correspond to the supposed unit of measure. Other than doing further investigation led by fault codes I would look at DPF differential pressure (back pressure) the measured not calculated value of soot compared to how many kms since last regen which will probably be shown as meters despite the units being kms, ignore the ash reading be it volume or weight as its a fantasy estimated figure and may have been reset to zero in the past.

I live with it, I will put it through a brush car wash maybe once a year but not down here because it costs €8 whereas the exact same car wash in an identical filling station of the same supermarket group costs €4 when I go back up to Northern France.

Do you remember the base and clear metallics of the late 80's Fords and probably later on as well? The clear coat was sprayed when the doors, bonnet and tailgate were fitted and closed so all the shuts were bare unlacquered basecoat which looked K-rap and they could not be cleaned properly as the rough paint finish held onto dirt and grime.

Hard to say without knowing either the engine or the gearbox but it probably has synchromesh on reverse gear, the 6 speed boxes do although I dont know if its all 6 speed variants, I think the 5 speeds on my last 2 cars have had it also, in fact I don't think any car of mine since the late 80 Sierras with MT75 gearboxes has not had synchromesh on reverse gear. The days of declutching and waiting before gingerly selecting reverse to avoid the crunching and gear tooth damage are long behind me but the driving reflex remains.

The glowplug connectors have been removed from the two glowplugs visible in the video, probably all 4, the unshrouded connectors are laying on the engine block, the one sparking is shorting to earth being dragged over the engine block by the vibration, the effect on the video looks like a massive 100kv spark generator but in reality will be like the spark from disconnecting a battery being charged or discharged. It will be that intermittent short circuit that has blown the fuse and melted the wiring, reconnect the glowplug connections, replace the fuse and all should be well unless the ovecurrent has welded the relay contacts together. I'm surprised that me with my poor vision is the only one to have noticed this!

Thanks Ernie, I can see it now from the diagram, I think the diagram is incorrectly drawn though as it does not show the return fuel circulating through the venturi loop in the LH saddle but going directly to the RH saddle via component 6. Now I am questioning whether my Yeti actually has a second level sensor on the LH saddle, did I recall seeing a cover plate? I cant remember, VCDS shows the fuel volume on both sides but that could be an estimated figure, did it show the resistance readings for both sensors? Again I cant recall. Every day is a learning day, there is so much clever stuff within our vehicles often hidden away that we are unaware of.

I don't think we have had this conversation before other than you probably correcting me in regard to Fabias, an incorrect assumption that I often make.

No I always defer to your knowledge, my belief is from repairing too many times the rear wiper on the MK2 Octavia, initially I could not work out what the wiring was to fault find it, then I deduced it was Canbus, one large 12v conductor, one large ground conductor and a twisted pair. You could not hot wire the thing putting 12v across the 2 large conductors you had to strip the casing and jump the 12v to the motor winding output of the PCB. I'm pretty sure there was a resistance across the 2 data terminals which I took to be a termination (end of line) resistor. Maybe through your portal you can pull up a wiring diagram for the 2006 Octavia 1.9PD Elegance. I believe the Yeti is the same but only through observing the same cabling when I removed the tailgate trim to fit a reversing camera, in fact I recall now I tapped into the 12v supply and ground of the rear wiper motor to power it, it had the unintended consequence of lighting up the LEDS for reversing all the time the vehicle was driven so I cut through the track to them to disable them, they were daylight white not IR and shouted "nick me - nick me!" the feeble reversing lights give enough illumination for the camera at night when it switches to B&W mode.

I would not like to be in the hypothetical position of someone whose car is coming up to the end of the lease or whatever contract expecting to chuck it in and pay a similar monthly amount for the latest model of their s***box, who was happy in the knowledge that repairs and faults were something that concerned others who bought their cars and not them with the manufacturers warranty. Then one month before exchanging it after having spent ages having test drives, negotiating deals etc on the next s***box this strange light comes on the dashboard, nothing to be concerned about, its not my car, the warranty will cover it, I will carry on my journey and then tap-tap-tap-knock-knock-knock CLATTER CLATTER CLATTER Car recovered by dealer and then presented with a bill for £13k and probably (not sure how these things work) having to carry on paying the rental until the repairs are done (at full main dealer price, no second hand engines) and the lease company can accept it back to sell at auction. Maybe even being taken for £1800 for a strip down and photo session. The OP owning the vehicle has options like selling it on, unfortunately he is £900 down and will be selling a car with nothing under the bonnet and a boot full of oily bits and pieces, unsure even if all the parts are there, a car that can only be moved on a trailer, the £900 spent will have significantly reduced the value of selling it unmolested as a repair project.

My 2006 Octavia and 2015 Yeti both are, they are of course the same platform, I had assumed that anything newer with any sort of functionality would remain with the Can comms type, I can understand a basic model like the Fabia and Roomster having a simple system, its with them that I usually make a wrong assumption.

Thanks, it was a 50/50 guess on my part whether the rear wiper system followed the Octavia or Fabia platform architecture. The simpler Fabia system is far easier to faultfind, I will edit my previous erroneous posting.

Additives will not know or care that the bottle has been opened and some of the contents used, exposure to engine heat, mechanical shear and combustion gases is a different matter.

🤣

Not true of the rear wiper motor which does indeed contain a canbus node however........................ Edited, this is wrong, my guardian angel has once again enlightened me, the Roomster uses the simpler Fabia system It could be that a previous owner removed it for vanity reasons and got fed up with a no comms error code in VCDS so removed it from the Can Gateway controller installation list. I would first check the cable cores in the rear door bellows, there are probably broken or fractured ones, ditto for the front passenger door electrics but check the drivers door loop first. No relay in the front with canbus comms, the switching is done by the canbus node in the rear wiper unit/ Edited, incorrect, see above.

Why bother, cars never used to have synchro on first gear and reverse gear has been generally non synchro until recent years (the Ford MT75 gearbox was the first I experienced), you just need to adopt the practices of yesteryear - wait fo the input shaft to stop spinning before engaging first gear (you may already do this in reverse) or if in a hurry you have already found the work around which does exactly the same as the first gear synchro would do were it working.

1st gear synchromesh cones worn. Amazing given that 5th 4th and 3rd are the ones that get worn through downchanges and your gearbox will have twin synchro hubs per gear, wear is virtually unheard of. I reckon your car had a clutch hydraulic failure (very common) and was driven without the clutch but the driver did not know to pull away in 1st gear by starting the engine and instead tried forcing it into gear. A shame as they are otherwise bullet proof .

Welcome to France again 😁 in time you will view the term ex-pat as a pejorative when someone refers to you as one! It's understandable to feel like one initially. In 2005 I went for a year without even thinking about registering my car, when I asked around nobody had a clue, the French had never needed to know about importing a vehicle and the few Brits that I eventually did find who most certainly described themselves as expats were still driving UK reg'd cars after a decade and going across the channel every year for an MOT when it was 2 years here, they thought I was crazy.

For sure they dont want to sell cars, only finance, they want even less to have to repair them but have no choice, so they keep increasing the stupid parts and repair prices up for as long as people are willing (daft enough) to pay them. They must have special training in keeping a straight face. Before VAT when there was purchase tax on new vehicles you could buy all the component parts of a car (purchase tax free) and assemble the vehicle yourself at home for a great saving, I'm not talking about kit cars although that is what created the industry but production vehicles notably the Morris Minor, I also knew people that built MK1 Escorts from a new shell and all new parts cheaper, both got new registrations. If that were to be done with a modern car just buying the gearbox or rear differential on a 4x4 variant plus a pair of matrix headlights would take you way over the price of a new vehicle

Of course it can, it will have a feed pipe going from the LHS to the pump on the RHS with a valve that closes when there is no suction resistance, the opposite to the safety valve on a butane/propane cylinder regulator. There is no seperate pump, please enlighten me on this venturi system that you speak of.

Something has got very silly in the modern world when a 6 year old car is supposedly worth £16-19K, when a dealer wants £900 to drop a sump and inspect for debris and another £900 to take a photograph of it, when the main dealer wants £13K to fit a new engine and non franchised dealers want £9K, when a second hand engine for a 9 year old car costs £3k I have bought multiple 3 year old vehicles over the years and usually paid less than £3K for them. Maybe its to persuade people who have no choice but to pay the dealer to do any repairs to rent new vehicles on PPwhateveritscalled and chop them in for a new one when the warranty expires. How much would this vehicle have cost new in 2019?

Consider it a bonus 😁

Sounds like self levelling headlights then, follow the advice from PetrolDave. The rapport final should be as the name suggests the last thing on the CT failure certificate, it tells you what things are just advisory, what should be corrected but no return visit (contra visite) required, what must be fixed and represented within 2 months and what is considered to render the car dangerous to drive on the road. I am asking to see the rapport because even with a "failed CT" requiring a contre-visite you can still register a vehicle however the mention of headlights will often sound alarm bells with ANTS, they will look at the CofC and request proof that conforming LHD headlights have been fitted, in your case your headlights should have the necessary EU homologation but it could slow things down especially if your French is not good. If you are paying this immigrant (he is not an expat) garagiste to register the vehicle on your behalf then you are stuck with what he says or wants regardless if it is necessary. To further explain based on what you have said you have a CT certificate valid for 2 months which will be extended to a year if the required works are done within 2 months, the law has been satisfied, you know what you are letting yourself in for (you are treated as a purchaser) and can register the vehicle even if the CT has défaillances majeures but not with défaillances critiques.