Apparent think I will need help on this.

I read most of the post about HOT weather startup problem, but all of them does not seem to be 100% adequate for my situation. Most of them are regarding TDI engines, or the issue is that the car do not fir up at all. This is not the case for me.

Car: Skoda Octavia VRS 2.0 TSI 220 hp. Major service has done 500 km ago (spark plugs, etc.), the problem before the service and after service, Skoda workshop had not identified the problem, stop/star system, key-less.

Situation:
Car in an ambient temperature of around 30 degrees C (what is cold where I live) but in the shade, I would say starts very well. When exposed to sun and being parked outside in ambient temperature around 40 deg C developed a problem where the very first startup looks as follow:
1) engine is cranking good, and the engine goes to something like 900 rpm,
2) immediately when it reaches the rpm you can notice very uneven engine reves and the engine stalls
3) car by itself initiate immediate start, and all is good (no problems)
4) for the rest of the trip all is good, starting stopping (all)

Dealer during major service had not identified any issue (it is kind of random), the problem happens when it is hot outside, the battery is 2 years old. I had not made OBD diagnosis, but I can report that the engine light is not turning on the dashboard.

I had noticed some post about software update, but that was for TDI engines, few about ERG but that had so slightly different symptoms, few about thermostat issue wherein this case engine did not start at all (different to my case) so now I am in the point where I am not sure where do go no.

Maybe one of the forum members have knowledge about this issue or can pinpoint me to the correct thread. 

 

 

I'll take a long guess at a stab of either a dodgy spark plug or coil pack, get the dealer to double check them especially as they were changed.

Older VWs had issues like this caused by the coolant temp sensor, but I've no idea if that's something that's still relevant.

I was wondering if the quoted temperatures were just high enough to stop cold enrichment working too.

Thank you all for help

More details on the situation, the engine starts as in some cases "worm" after startup the reves are at the level of 750 rpm.  Engine temperature after starting around 55 deg C. Issue happens randomly can't see any correlation.

Quick connection to OBD computer shows error in the ECU memory: "P2251 - O2 Sensor Negative Current Control Circuit Open Bank 1 Sensor 1" . So it looks that the issue is with lambda sensor (not sure about this). It should be mentioned that "check engine" light is NOT on. During incorrect startup the engine idling at 500 rpm and sounds like it is working on three cylinders (but maybe that's me). After applying a bit of accelerator, all is fine. Also, after stooping and restating the engine problem go away. 

I was considering ignition coils, bad battery and the incorrect "cold" star setup for the region, but now maybe it would be more logical to look in to the o2 sensor, dose this make sens? 

 

Some photos for reference.

With that DTC showing, I would certainly start with diagnosis of that o2 sensor, wiring harness, connector plug, testing the sensor itself.

 

With the major service just performed DTCs  should of been scanned for, so either it has only just been stored or they did not scan or did not tell you! 

It's been a wille and after 2 oxygen sensors, 2 sets of spark plug and cleaning all filters and sensors the latest conclusion by SKODA dealer is FLYWHEEL? Honest to god that docent even make sens to me! Also same "expert" identified that 5000 km old engine mounts need to be replaced! At this point this starting to be a joke. 

 

Dose it make sens for the flywheel to be the cause of my problem?

 

I guess you've solved the problem since then. I have the same problem, what was the cause?