Q: I have a 2010 GMC Sierra with a 5.3-liter engine. Recently the check engine light came on and, after having it diagnosed, I was told the oil pressure sensor switch was faulty. I had the switch ...

Affected components: master cylinder pressure sensor. Affected vehicles: 2019 Chevy Silverado 4500 HD 2019 Chevy Silverado 5500 HD 2019 Chevy Silverado 6500 HD 2020 Chevy Silverado 4500 HD ...

Everything as far as air/fuel, timing, fuel pressure, and the like, came back fine. Lee suggested we take a look at our existing air/fuel gauge/wideband sensor.