VW Tiguan MAP Sensor Issues: Power Loss & High Fuel Use

Had a similar situation with a 2015 VW Golf GTI. The symptoms matched exactly, poor engine performance, high fuel consumption, and check engine light. The manifold pressure sensor was showing incorrect readings, but the actual problem was a vacuum leak in the intake manifold. The diagnostic process revealed multiple issues: Failed pressure sensor gasket, Cracked vacuum lines, Worn intake manifold seals This was a serious issue that required immediate attention. Left unrepaired, it could have led to further engine damage and even worse fuel economy. The entire repair involved: 1. Complete vacuum system inspection 2. Pressure testing of the intake manifold 3. Replacement of damaged vacuum lines 4. Installation of new manifold gaskets 5. Sensor calibration The repair took a full day at the shop. When getting this fixed, its important to ensure they perform a complete manifold pressure test after repairs. Sensor failure symptoms can sometimes mask bigger underlying vacuum system problems. Also worth checking the intake manifold for any visible cracks or damage while the system is apart. A proper repair should include testing under different engine loads to confirm the fix. The check engine light should clear after the repair and stay off.

Thanks for sharing your experience. My car also started showing similar symptoms, and its good to know that checking the vacuum system was key. After reading your post, Im now wondering if my sensor replacement alone was enough, since I didnt get a full vacuum system check. Can you recall the total cost for your repair? Also curious if youve had any other manifold sensor or vacuum-related issues since the fix? Would help me decide if I should go back and request a more thorough inspection of my system.

Happy to report that after the complete repair job, my GTI has been running perfectly with no recurring manifold sensor or vacuum issues. The comprehensive fix was definitely worth it. The total came to 235€ for addressing the large vacuum leakage, which included replacing the faulty manifold pressure sensor. Getting the complete system checked was crucial, it revealed issues that might have been missed with just a basic sensor replacement. Based on your description, I strongly recommend having the full vacuum system inspected. While sensor replacement can help, underlying vacuum leaks often cause similar engine performance issues. The intake manifold needs proper pressure testing to ensure theres no hidden damage. The diagnostic testing showed that automotive sensor problems often point to bigger issues in the intake system. A thorough inspection now could prevent more expensive repairs later. After my repair, the fuel consumption returned to normal and engine performance was fully restored. My mechanic explained that car sensors can sometimes mask vacuum leaks, which is why complete testing is essential for proper diagnosis and repair.

Going with my gut paid off after dealing with this manifold pressure sensor situation. After seeing your replies, I took my Tiguan to a different mechanic for a complete inspection. They found exactly what you described, vacuum leaks alongside the sensor issue. The repair cost me 280€ total, which included: Full vacuum system inspection, New manifold pressure sensor, Replacement of cracked vacuum lines, Fresh gaskets all around The engine performance is now back to normal and fuel consumption dropped to regular levels. The check engine light cleared right after the fix and hasnt come back. Really glad I pushed for the complete intake manifold inspection instead of just swapping the sensor. Got to say, having the entire system checked was definitely the right call. The car feels like new again, and knowing all the vacuum issues are fixed gives me peace of mind. Thanks for steering me toward a more thorough repair approach.