Jack25

you're welcome :)

get a vcds and look for timing chain deviation and all other parameter related, in that way you will know for sure what is going on, probably even just listening at it wile idling can tell if something is wrong

Go for ContiTech; it is the manufacturer for original VAG parts. I replaced the auxiliary belt tensioner at 152,184 km around the end of 2024 because there was a little squealing sound in the freezing winter on cold starts. However, the belt from 2013 (original equipment produced by Continental) was still in perfect condition without any cracks or wear. I replaced it anyway just because it came in the kit. For the water pump, go for ContiTech as well I've just replaced a Fiat water pump with that brand, and it is not giving me any problems. my advice for the timing chain is to buy an original one it isn't very expensive and is a good quality item

I was having random misfire without any warning on the cluster even vcds didn’t show anything, after replacing ignition lead (for the updated one with the heat shield around each ignition lead) and the spark plugs the misfire was still present after replacing the ignition coil the misfire went away, from the outside it wasn’t presenting anything wrong so if is still the original try to replace it

it's a DIY look here https://www.youtube.com/watch?v=cr8IIU1RkLk be sure to pop the airbag cover from underneath in order to not damage it or the dashboard for reference: https://www.skoda-parts.com/spare-part/6q0959263a-heat-limiting-resistor-skoda-5971.html

look at my post here https://www.briskoda.net/forums/topic/538234-spongey-brakes-new-problem-with-abs/#comment-6000661 in the bottom of the page there is the explanation of the long coding

depend on your bcm realistically, i have the bcm 6R7937087P and i've retrofitted the following: Cruise control rear electric window cornering fog light (via turn signal or steereing imput) Climatronic anti theft system heated seats headlight washer rear pdc (and also front all oem amarok pdc unit and mk2 octavia wiring) multi function steering wheel Working on ASF tings that you can enable: via bcm: confort closing and opening of the window via the key fob (if not already active) visual confirmation of the closing window via key hole or key fob (the azzard blink once when all window close), after the retrofit of the cornering light via fog light you can code the steering angle and the speed for them to turn on, after the headlight washer retrofit you can chose how often you want to use it, via abs module (I have the 6R0 907 379 AF) and I manage to enable hill hold assist, indirect tpms and XDS is an electronic simulation of a meccanical differential basiccaly it brake the slipping tyre during a fast corner to improove traction to the other front wheel (it works only on the fron wheels), activation of the brake wipe if is raining and you have the wiper on the abs module will brake wery slightly to dry pads and brake discs, airbag unit: still under process (I need the time to do it) front passenger ccupancy pads (dectects if there is a weight on the seats and if the seatbelt isn't fastened the warning will beeping, instrument cluster, needle celebration when turning the ignition on, service intervals (I've setted mine to 10k km instaed of 15k km), steering assist weight I've setted mine to fabia vrs/polo gti to increase the weight of the steering, many other things that when I will remember that I'll update the post. (also a ton of mechanical mods).

keep in mind that all the immo data is stored in the cluster so new key and oem central locking retrofit require the key coding, also the mk3 cluster is not compatible too much different platform and software, look for 3dcolormfd for a display upgrade wich doesn't require a key program

if is a 1.2 tsi cbz my suggestion is that it could be a coil pack, look also for the ignition leads, being a 2015 it could be already equipped with the upgraded one (the difference is the heat sheild on the cable), a known fault that can cause a limp mode is the turbo actuator, in my 2013 fabia a faulty coil pack and later a worn spark plug never caused a limp mode 'just' the epc light followed by tcs ecc., (a completely worn ignitoin lead did cause a limp mode once). A faulty wheel sensor normally dosent cause a limp mode, in my fabia I've broken one wile replacing a front wheel bearing and no limp mode just abs tcs tpms warning, also on a 2016 octavia scout 2.0 tdi 184 bhp a snow chain sliced the wheel speed sensor causing all sorta of faults but again no limp mode.

Look also for the carbon build up on the intake valve, it's a direct fuel injection engine a walnut blast could be nice

look for the F&R sway bar links, but mainly look for all the rear subframe bushing, I suspect for some multilink arm

Stupid question have you ever changed the fuel filter?

Also you can try for a smoke leak test, if is a pcv o anything related to the intake sistem you will see the smoke escaping, however if you have vcds like said before look for chain stretch, fuel pressure and the activation and pressure for each injector

yeah my bad, i assumed by the dedicated pin that the wiring was separate, it could be a joint point worth to check

According to the wiring diagram each abs sensor have its own wire without joint G44 Rear right speed sensor G45 Front right speed sensor G46 Rear left speed sensor G47 Front left speed sensor J104 ABS control unit J519 Onboard supply control unit N133 Rear right ABS inlet valve N134 Rear left ABS inlet valve N135 Rear right ABS outlet valve N136 Rear left ABS outlet valve T38a 38-pin connector