Yukon MAF Sensor Failure Leads to Multiple Problems

I had nearly identical symptoms with my 2013 GMC Sierra, the performance decline was remarkably similar, especially the stalling and high fuel consumption. With some experience working on cars, I initially thought it was just a dirty air filter causing problems. However, after having it properly diagnosed, the mass air flow sensor had completely failed, throwing off the air-fuel ratio calculations. The repair process was straightforward. The workshop ran diagnostic tests to confirm the sensor failure, then ordered and replaced the MAF sensor. Total cost was 365 Euro, including parts and labor. After replacement, the issues disappeared completely, no more stalling, normal fuel consumption returned, and the exhaust went back to normal. To help further with your specific case, could you share: Current mileage on your Yukon? When was the last time you changed the air filter? Are there any other warning lights besides the check engine light? Have you noticed these issues getting worse over time or did they start suddenly? This information would help determine if you might be dealing with the same root cause or if there could be additional factors involved.

Wanted to add that mine just hit 125839 KM. The symptoms perfectly match what you described. The mass air flow sensor replacement fixed all my issues, poor fuel economy, rough idle, and excessive smoke. The air intake system was also cleaned during my latest service which helped optimize the air-fuel ratio. My check engine light finally turned off after being on for weeks. Definitely worth getting the MAF sensor checked by a professional since these symptoms are textbook indicators.

Thanks for the update on your Yukon repair! Its great to hear the MAF sensor replacement resolved your issues, as it matches my experience with my Sierra perfectly. The mileage you mentioned is actually right around when many of these sensors start showing problems. Getting the air intake system cleaned during service was a smart move, it helps prevent future mass air flow sensor issues and maintains proper air-fuel mixture readings. After my repair, I started checking and cleaning the MAF sensor area every 6 months to avoid future performance decline or engine stalling problems. This preventive maintenance has kept my engine running smoothly for over 40000 km now. One tip: if you notice even slight changes in fuel consumption or idle behavior in the future, get the MAF sensor checked early. Catching issues before they become severe can prevent more expensive repairs and keep the engine running at optimal efficiency. The fact that your check engine light is now off confirms the diagnosis was spot on. These sensors are critical for proper engine operation, and when they fail, they typically show exactly the symptoms you experienced.

The MAF sensor replacement completely fixed my Yukon issues. After hitting 125839 KM, I started noticing serious problems with fuel economy and engine performance. Getting both the sensor replaced and the air intake system cleaned made a huge difference in the air-fuel ratio and overall engine behavior. The repair cost was definitely worth it since the sensor failure was causing multiple issues. My fuel consumption is back to normal, no more rough idling or exhaust smoke, and the check engine light finally turned off. The mechanic confirmed these symptoms were classic signs of a faulty mass air flow sensor. For others dealing with similar problems, I recommend getting it checked early. The diagnostic process was straightforward, and fixing it prevented potentially bigger engine problems. Regular cleaning of the MAF sensor area is now part of my maintenance routine to avoid future issues.