VW Touareg Fuel Sensor Causing Stalls and Rough Idle

Had the same symptoms on my 2016 VW Tiguan with the 2.0 TSI engine. The rough idle and engine stalling turned out to be a damaged wiring harness connector at the fuel pump assembly. The check engine light came on after several instances of stalling at traffic lights. The fuel pressure sensor readings were inconsistent, causing the ECU to deliver incorrect amounts of fuel. Initially thought it was the fuel pump, but diagnostic testing revealed the connector issue. The damaged pins in the connector were causing intermittent electrical contact. The repair involved replacing the entire wiring harness connector and testing the fuel pressure sensor functionality. This was a serious issue since it could have led to complete fuel system failure and potential engine damage if left unaddressed. The symptoms match your case exactly, jerky acceleration, rough idle, and stalling. These issues typically point to fuel delivery problems. Would recommend having the wiring connections checked first before replacing more expensive components. Based on your description, getting a proper diagnostic scan should be the first step, focusing on the fuel system electrical connections rather than immediately assuming a sensor failure.

Thanks for describing your repair experience. Your diagnostic process saved me from unnecessarily replacing parts. I had my Touareg checked and you were right, the engine misfire and stalling issues were indeed caused by damaged wiring connections affecting the fuel delivery. Did any other fuel system problems show up after fixing the connector? Also, would you mind sharing what the total repair cost was? The shop gave me a quote but I want to compare prices before proceeding.

Your diagnosis was spot on about the wiring issues. Since getting the damaged fuel pressure sensor connection fixed for 95€, my Tiguan has been running perfectly with no engine misfire or stalling problems. The fuel delivery system works flawlessly now, no jerking during acceleration or rough idling. The repair shop did a thorough check of the entire fuel system while they were at it and found no other issues. The fuel injectors were all functioning normally and the fuel pressure readings have been stable since the fix. Its been 6 months now without any problems returning. Getting the wiring connection repaired early likely prevented more expensive fuel system damage. When electrical issues affect fuel delivery, they can sometimes cascade into bigger problems if left unfixed. The price you were quoted seems reasonable considering the diagnostic work needed to pinpoint electrical issues in modern fuel systems.

Thanks for the helpful advice. I had my Touareg serviced last week and wanted to share the outcome. The mechanic found corroded wiring connections affecting the fuel delivery system, just as suggested. The repair cost came to 120€ including parts and labor. The rough idle and stalling issues are completely gone now. My fuel economy has actually improved since the fix. The check engine light cleared up right after they repaired the connections. Really glad I checked the wiring first instead of replacing the entire fuel pressure sensor. The shop did a full inspection of the fuel pump and injectors while they had it open, everything else checked out fine. No issues since the repair and the engine runs smoothly even at low speeds now. Definitely worth getting it fixed before it could cause more serious problems. Best repair experience I've had in a while. The diagnostic process saved me from spending more on unnecessary parts replacement.