Look under the driver side dash, near the front. You will see the plug there.
2005 chevy trailbazer
You will get error code P0016. And you will hear engine knock.
With a code reader. Have your local auto parts store read the code(s). They provide this service for free.
Secondary air injection malfunction. Maybe the air pump failure or a leak?
If you don't have a code reader you can disconnect the battery cable for a couple of minutes and that will reset the light
Trouble code P0128 means: ECT Sensor Below Thermostat Regulating Temperature
The check engine light sets a code for diagnostics and you need a code reader. Most auto parts stores sell code readers and most will check the codes for free.
The radio code for a 2005 Chevy Trailblazer can be obtained from a Chevy dealership. Radio codes will be provided when a VIN number is presented and proof of ownership of the car.
Reduced engine power is always accompanied by a trouble code. You must get the code diagnosed in order to establish your fix procedure. Get the code read at Autozone or someone that has a OBDII code reader.
A code reader that will work on the OBD I system.
You must first get the code read and find out what made it come on. Then the code can be errased at the same time with the code reader. If the code was an anomalie then the light will go out after 3 or 4 drive cycles.
Trouble code P0171 means:System too lean (Bank 1)