VW Taos Rail Pressure Sensor Failure Causing Stalls

I had similar symptoms on my 2020 VW Tiguan TSI. The fuel injection system was showing intermittent pressure drops, triggering the check engine light and causing severe performance issues. The rail pressure sensor malfunction initially caused unusual stalling and significant power loss. The diagnosis revealed the pressure sensor was sending incorrect readings to the ECU, making the fuel injection system operate inefficiently. This turned out to be quite serious since faulty readings can lead to improper fuel mixture and potential engine damage if left unchecked. The fix required replacing both the rail pressure sensor and cleaning the fuel injection system to remove any contamination. The repair process took about 4 hours at the shop. After replacement, the engine performance returned to normal, idle stabilized, and the check engine light cleared. Given the symptoms you describe, it sounds very similar to what I experienced. A proper diagnosis using a scanner will confirm if your rail pressure sensor is the culprit. This isnt something to postpone, as continued operation could affect other fuel system components.

Thanks for sharing your experience with the Tiguan. This sounds exactly like what I am dealing with on my Taos. The symptoms match perfectly, especially the unstable idle and power loss you mentioned. The fuel injection system in these engines seems quite sensitive to pressure sensor issues. Do you remember roughly how much you ended up paying for the complete repair? Also, has everything been running smoothly since the sensor replacement, or have you noticed any other fuel system related problems?

Thanks for asking about the follow-up. Since getting the repair done, my fuel system has been running perfectly without any engine stalling or performance issues. The rail pressure sensor signal is now working correctly after the replacement. The total cost came to 240€ for the pressure sensor replacement, which included parts and labor. It was definitely worth fixing promptly since incorrect fuel pressure readings can really damage the injection system over time. The engine performance returned to normal immediately after the repair. No more power loss, unstable idle, or check engine warnings in the 6 months since. The fuel consumption has actually improved slightly now that the injection system is getting accurate pressure readings. If your symptoms match what I experienced, getting the pressure sensor checked should resolve the issues youre having with your Taos. Just make sure they do a proper diagnostic scan to confirm its the same problem before replacing parts.

I took your advice and went to get it checked out today. The diagnostic scan confirmed exactly what you suggested, a faulty rail pressure sensor. The engine performance issues matched your description perfectly. The shop charged me 280€ total, a bit more than what you paid but still reasonable considering the work involved. They completed everything in about 3 hours, including a thorough fuel system cleaning. The difference in engine performance is like night and day. No more stalling, the idle is smooth, and the power delivery is back to normal. The check engine light cleared right after the repair. Really glad I asked here before visiting the shop. Having your experience as reference helped me avoid getting overcharged or misdiagnosed. The pressure sensor was definitely the root cause, just as you suggested.