Warrior193

I'd be more than surprised if limp mode was activated without a DTC being generated! What fault light displays on the instrument cluster when this happens? What equipment are they using to check?

I'm rather surprised your 2015 Octavia has the battery SOC indication available, is yours early or late 2015? My 2015, MY16 just displays SOC--- and I understood the function was deleted around 2014.

Love the way the MG's parked - not!

A brief search on the net suggests the 3.6 EA390 engine is a particularly good one, with only a couple of known issues - early ignition coils and crank seal oil leaks on high milers. Said to be good for 400 K km. How is the suspension and gearshift?

Welcome to the forum, The rust along the top of the windshield looks very minor, probably from paint being polished away from roof edge - probably not too difficult to address reasonably. Not familiar at all with the 3.6 engine, but I'd think it would be good for another 100k Km at least, very common these days for smaller engines to do that sort of mileage - how does the asking price compare with similar vehicles?

A 'Stop-Start battery IS the main battery - it is simply an improved design and materials over standard, lead-acid batteries to allow for the added stresses of repeated start cycles. There are two types of stop-start batteries - EFB or AGM - yours is more likely to be EFB, but check first.

Not a lot of contact area there, try onto the body of the cable ferule, where the insulation meets the socket. Is the stamped part of the L-shaped metal bracket painted? If not, use that.

Take a search cruise through the forum, I'm sure I've seen some posts on removal of tailgate lining panel. I have a slight recollection that it requires good trim removal tools and a fair bit of force! - the C-pillar trims are bad enough, and I chickened-out with the A-pillar ones!

Check that the rubber seals aren't sticking to the hatch - my Mk3 trunk sometimes sticks shut in hot weather, when it does this, it feels like it hasn't unlocked but a heaver pull breaks the seal. Try a rubber seal conditioner like Gummi Pflege (cannot swear on spelling for second word) Other seal conditioners are available.

^^^ With genuine, all-weather 300+ mile range.

On some vehicles, it can be quite frightening to feel just much more foot pressure is required if the brake servo fails. Part of the problem is your leg muscles become totally accustomed to the assistance provided. It can be very educational to do a test somewhere totally safe and at low speed, switch off the engine, deplete the reserve vacuum, then try to stop!

Fix the Lambda issue first, then investigate further for the coolant loss.

According to Rosstech Wiki, P0030 indicates a problem with the Lambda sensor - Open circuit Bank 1, Sensor 1. This will certainly cause fuelling issues - but I'd expect the ECU would overfuel, which would cause black smoke! The cause of that DTC could be something as simple as a broken wire at the sensor connection. I'd stick with your white smoke being coolant getting burnt.

If I recall correctly, white smoke from a diesel indicates burnt coolant - although I'd expect more than 0.5 litres being used if the smoke is as heavy as you indicate. Have the coolant tested for combustion products and locate source of loss. Was the engine losing coolant before the turbo was replaced? If not, possible that your garage has created a leak in its cooling circuit and then repeated mistake. Did the turbo replacement fix the oil use issue?

Or possibly Bewick's Swan.

Is the engine actually losing coolant? If so, how much? Could be faulty head gasket or cracked head - has the engine been overheated? Have the remaining coolant tested for combustion products and have the cooling system pressure tested.

If you are using a smart charger, you may have an issue triggering the charger if the battery voltage is very low (below about 8 volts) . There may be a note in your charger instructions on how to overcome this.

A thing that puzzles me is why are you trying to defeat the anti-syphon device while filling the tank? it's not necessary - the clue is in the name, it only there to prevent fuel being drained via the filler.

I'd vote for too much mayo, even allowing for regular short trips.

Did they confirm that the DSG filter screen was cleaned?

That tends to suggest that the oil spill she noticed in the car park isn't from yours.

Certainly on the Mk3, the engine power cuts-out if the brake pedal is pressed while throttle is open - accompanied by a message on the infotainment screen.

Place a weighted piece of clean cardboard under the engine the next time it's parked up at home.

Is there any sign of oil leaking from the bottom of the clutch bellhousing?

'The curse' is where as soon you mention an item to be trouble-free, it fails - AKA Sods Law. ☹️