VW Golf Hybrid: Failed Manifold Sensor Cuts Performance

Had a similar issue with my 2015 Golf GTE hybrid last year. The symptoms match exactly what you describe, power loss, sluggish acceleration, and increased fuel consumption. The manifold pressure sensor was failing to provide accurate readings to the engine control unit. A vacuum leak test revealed significant pressure loss in the intake manifold system. The manifold sensor replacement alone did not solve the problem, as there was also a cracked vacuum line contributing to the issues. The sensor was showing incorrect pressure readings due to the combined problems. In these hybrid systems, proper manifold pressure sensing is crucial for optimal engine performance and fuel efficiency. The complete fix required both sensor replacement and vacuum line repair to restore proper pressure readings and engine performance. This is considered a serious issue since incorrect manifold pressure readings can affect: Fuel injection timing, Turbo boost control, Overall engine performance, Long-term engine health Getting a proper diagnostic test focusing on the manifold sensor and vacuum system is essential. Temporary fixes or ignoring the symptoms can lead to more expensive repairs later.

Thanks for sharing that experience with the manifold pressure sensor. My Golf actually faced a very similar situation a few months ago, with poor throttle response and engine performance issues. Based on your feedback, I took it to a specialist who confirmed the sensor failure diagnosis. The intake manifold pressure readings were way off, causing all sorts of performance problems. I went ahead with the sensor replacement, but now Im curious about the vacuum line you mentioned. So far everything seems fine after the fix, but Id like to keep an eye out for any potential vacuum system issues. Can you remember roughly how much you paid for the full repair? And has everything stayed working properly since the fix was done? Just want to make sure Im not missing anything that could pop up later.

Thanks for the follow-up. After getting the faulty manifold pressure sensor and vacuum issues fixed last year, everything has been running perfectly. The total repair came to 235€, which covered fixing a large vacuum leakage they discovered during the diagnostic test. The car sensor replacement alone might have masked the underlying vacuum problem, so Im glad the mechanic did a thorough check of the intake manifold system. Since the repair, the engine performance and fuel economy returned to normal, with no warning lights or issues reappearing. The intake manifold pressure readings have stayed stable, confirming both problems needed addressing. If your car sensor repair resolved the symptoms completely, you might not have the vacuum line issues I experienced. But its smart to monitor for any changes in performance or unusual engine sounds, as pressure sensor readings can be affected by various intake system problems. Regular diagnostic checks of the manifold sensor and vacuum system can help catch potential issues early before they impact engine performance.

After seeing all those problems with my Golf hybrid, I finally went to get it checked out at a new mechanic shop that specializes in hybrids. The manifold sensor replacement cost me 190€, which seemed fair given the diagnostic work they did. The mechanic explained how the MAP sensor readings were completely off, causing the engine performance issues. The repair process took about 3 hours total. They ran multiple tests on the intake manifold system to make sure there were no additional problems like vacuum leaks. Must say the difference in performance is incredible, the throttle response is back to normal and the engine runs smoother than before. Its been about 2 weeks since the fix, and the fuel economy has improved significantly. No more check engine light and the car feels like new again. Definitely keeping an eye on the manifold pressure readings through my OBD scanner just to be safe, but so far everything looks perfect.