VW Golf Hybrid MAF Sensor Issues Causing Multiple Problems

Had almost the exact same issue with my 2019 VW Passat Hybrid last winter. Started with poor fuel economy and progressed to stalling. Being somewhat experienced with basic car maintenance, I first tried cleaning the MAF sensor myself using a specialized cleaner, but the check engine light persisted. Took it to a workshop where they confirmed the sensor failure through diagnostic testing. The MAF sensor was completely defective and cleaning would not solve the problem. Total repair cost was 365€ including parts and labor. Since the replacement, fuel economy returned to normal and no more stalling issues. Before suggesting more specifics about your situation, could you share: Current mileage on your Golf, When you first noticed the symptoms, Whether you have already tried cleaning the sensor, Any diagnostic codes from the check engine light This information would help determine if your case is similar and whether you might face the same MAF sensor issue. These sensors are critical for proper engine operation, particularly in hybrid systems where precise air-fuel mixtures are essential for efficiency.

Thanks for the detailed response. My Golf just had its last service 3 months ago at 82264km. Already tried cleaning the air intake and MAF sensor with specialized cleaner last weekend, but the issues persist. The engine stalling and poor fuel economy continue, plus the check engine light stays on. The diagnostic showed error code P0101, which apparently confirms the mass air flow sensor malfunction. Given your experience with a similar issue, I will probably go ahead with the sensor replacement rather than waste more time troubleshooting. Planning to book a repair appointment this week.

Thanks for the follow-up details. With the P0101 code and unsuccessful cleaning attempt, you are definitely on the right track. The symptoms match exactly what I experienced with my Passat before the MAF sensor replacement. Since your Golf had recent service, make sure to check if the air filter was replaced then. A clogged air filter can contribute to MAF sensor issues and poor fuel economy. In my case, I also had the air filter changed during the MAF sensor replacement as a preventive measure. The 82264km reading suggests normal wear for a 2021 model. My MAF sensor failed around 75000km, which seems to be a common lifespan for these parts in VW hybrids. The new sensor has been working flawlessly for over 20000km now, with fuel economy back to factory specs. One tip: when they replace the sensor, ask them to inspect the electrical connections and wiring harness. My mechanic found slight corrosion on the connector pins which could have contributed to the sensor failure. Cleaning the connections during replacement helps ensure optimal performance of the new MAF sensor. The 365€ repair cost I mentioned earlier included this additional inspection work. Prices may have changed slightly since then, but it should still be in that range.

Thanks for all the helpful information. After reading about your experience and seeing the similar symptoms, I feel more confident about proceeding with the MAF sensor replacement. The P0101 code and failed cleaning attempt definitely point to the same issue you had. I called the workshop and booked an appointment for next week. They quoted 380€ for the complete job, including the air filter replacement you suggested. They also confirmed they will check the electrical connections and wiring harness as part of the service. The timing seems about right since my Golf is at 82264km, close to when your sensor failed. Really hoping this fixes both the fuel economy and stalling issues. Will monitor the air-fuel ratio readings after the repair to make sure everything returns to normal. I appreciate the advice about checking the air filter too. Will make sure they inspect it properly during the repair since it could have contributed to the problem. Looking forward to getting this sorted and having the car running efficiently again.