VW Bora Fuel Stalling: Troubleshooting Sensor Issues

I had a very similar issue with my 2006 VW Golf with the 1.6L gas engine. Having some experience working on VWs, I first suspected the fuel pressure sensor too, since the symptoms matched, engine stalling, rough idle, and jerking during acceleration. Took it to my regular workshop where they diagnosed a faulty wiring connection to the fuel system pressure sensor. The cable had worn through in spots, causing intermittent connection issues that disrupted proper fuel delivery. The repair involved replacing the damaged wiring harness section and connector, which cost 95€ including labor. The fix completely resolved the stalling and jerking issues. The engine now runs smooth again and the check engine light cleared up. In these cases, while the pressure sensor itself often gets blamed, sometimes its just the electrical connection causing similar symptoms. What engine size does your Bora have? Also, have you scanned for error codes? This information would help determine if your issue is identical to what I experienced. The fuel delivery problems can stem from various components in the fuel system, from the fuel pump to sensors and wiring.

Last service was at 55000km and since then the engine misfire has become much worse. Just wanted to add that I got the error codes scanned today, P0171 and P0172 showed up. The shop quoted 250€ just to replace the pressure sensor, which seems steep. The engine stalling happens more frequently now, especially during cold starts. Can anyone confirm if this diagnostic and price sounds reasonable?

Thanks for the update on those error codes. On my Golf, I initially faced similar codes, P0171 and P0172 typically point to fuel mixture issues, which matches your symptoms. The 250€ quote for replacing the pressure sensor seems high compared to the wiring fix I needed. Before committing to the sensor replacement, consider that these codes often appear when there are vacuum leaks or problems with the mass airflow sensor. The fuel pressure sensor might not be the root cause. In my case, the damaged wiring was causing similar symptoms but cost significantly less to fix. Since your stalling issues worsen during cold starts, this reminds me exactly of how my car behaved before the repair. The check engine light would come on more frequently during cold weather, and the engine stalling became more pronounced over time, just like yours. The fuel economy probably took a hit too, mine was terrible until the wiring got fixed. If you want to avoid unnecessary parts replacement, ask the shop to specifically check the wiring connections to the fuel system components first. This could save you money if you have a similar issue to what I encountered.

Thanks for the input. After reading about similar experiences, I decided to get a second opinion from another workshop. They found that the wiring to the fuel pressure sensor was actually damaged, just like described. The new quote is much more reasonable at 110€ for fixing the wiring rather than replacing the entire sensor. The symptoms match exactly what experienced, the rough idle and engine stalling gets worse during cold starts, and those error codes P0171 and P0172 pointed to the same fuel delivery issues. My fuel injector performance has been really poor lately, causing the engine to run really rough. Will get it fixed next week and update on whether this solves the check engine light and stalling problems. Glad I asked here before spending 250€ on potentially unnecessary parts. Makes sense to check the wiring first when dealing with fuel system issues since it can cause identical symptoms to a bad sensor.