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This morning, I performed a cold start, and a Start-Stop system error appeared immediately (though the Check Engine Light / MIL remained off). After a 15-minute drive, I stopped at a gas station to refuel. The vehicle was stationary for about 5 minutes. Upon restarting, I drove 10 meters to the main road and stopped; the Start-Stop system engaged correctly, and the engine stalled/shut down as intended. After another 10 minutes of driving, I stopped in a traffic queue, but the engine failed to shut down. I checked the vehicle status menu, which displayed a Start-Stop error. Five minutes later, I cycled the ignition (turned the car off and on) about 100 meters before my destination. The start-stop error cleared, and upon reaching the parking spot, the engine shut down automatically. After the car sat for 5 hours, I took a short trip (under 5 mins), and the Start-Stop error reappeared instantly. Following a 30-minute soak time, the error persisted on the return trip. Again, I cycled the ignition shortly before parking; the system reset, and the engine shut down normally at the destination. Scanning the vehicle with OBD11 revealed the old P25AB00 Piston Cooling Oil Control Circuit High. Toward the end of the day, the Check Engine Light (CEL) illuminated, and the Start-Stop system became permanently disabled. The service center is currently in contact with Škoda’s technical support for consultation. They are awaiting a response. They've also double-checked the bypass and used a cleaner spray on the contacts. Interestingly, the fault did not reappear at the service center after they inspected the car, cleared the codes, and performed a 40 km test drive with over 20 ignition cycles. During their testing, the car reached full operating temperature. In contrast, when I'm driving, the error occurs very quickly—usually after just a few trips. Will report back :)

Thank you D402, but I don't think the recent bypass is the culprit. The issue was already present before it was installed and has persisted since. I’ve recently noticed that the fault resets itself if I cycle the ignition about 3 times once the engine is at operating temperature (100°C+). Between each cycle, I drive a short distance of approximately 100 meters and reach a speed of 50 km/h. When starting from a cold soak, the Auto Start-Stop error triggers immediately, followed by the Check Engine Light (CEL) after the third cycle. However, repeating these short 100m drives and ignition cycles while the engine is hot seems to clear the fault.

Hey everyone, I’m looking for some insight regarding an issue with a 2022 Skoda Superb Combi 2.0 TSI 4x4 (280hp). The car has 130,000 km on the clock and was imported from Germany. The Issue: The Check Engine Light (CEL) is on. Upon startup, the dashboard also displays a "Start-Stop System Error." Diagnostics: Using OBDeleven, I pulled the following fault code: P25AB00: Piston Cooling Oil Control Circuit High What has been done so far: Solenoid Replacement: The dealership technicians first replaced the valve associated with this code—if I’m not mistaken, this is the N522 valve, which regulates the oil flow for piston cooling jets. This did not fix the problem. Wiring Inspection: They spent about two weeks troubleshooting the wiring harness between the N522 valve and the ECU. They eventually found a potential fault and performed a wiring bypass for a specific cable. After this, the error disappeared. Current Status: Two days later, the error returned. The symptoms and the fault code are exactly the same. It triggered in the morning immediately after a cold start. I cleared the code, but it came back after about three drive cycles. The service center has now contacted technical support and sent over the diagnostic data to see if they have any further guidance. Driving Behavior: Aside from the warning light, the car drives perfectly fine. Oil temperatures reach about 105°C during normal to spirited driving. Has anyone dealt with this before? Any opinions on what else we should check? Thanks a lot for your time and help!