If you have the code you can change the sensor yourself. The sensor is located on the exhaust manifold. It sometimes is related to something else. For complete info and troubleshooting visit our enthusiasts forum at www.trailvoy.com
My car when slow stop engine
Coolant Temperature Sensor/Switch (For Computer)Engine, Left Front
where is the map sensor located on a 2005 gmc envoy
Engine coolant Sensor is bad. I have the same error on my 2005.
It should be at the very top near the back of the engine. Just to the right side of the "Vortec" cover on a 4.2 engine.
With an OBD2 scan tool.
Mas air flow sensor
The crankshaft position sensor on a 2002 GMC Envoy is typically located near the bottom of the engine, often on the engine block or near the crankshaft pulley. To access it, you may need to remove the engine cover and, in some cases, other components that obstruct your view. It's advisable to consult the vehicle's service manual for specific details and diagrams for your model.
fuel level sensor
Drivers side exhaust pipe just after the exhaust manifold. Best reached from underneath.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Have vehicle scanned to determine the problem and have codes cleared