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What causes the check engine light to come on a Chevy trailblazer 2003?
Wiki User
∙ 9y ago
Oxygen sensor, Transmission overheating, Idle Air Contole Vale, Mass Air Flow Sensor, Emissions related equipment...ETC There are dozens of reasons, you need to have a scanner plugged into your OBD2 port and scanned for codes. From those codes you will find out what you need to do to correct the problem. These codes may or may not end up costing you hundreds to fix. But it is extremely important to get this checked before driveability problems arise.
If it is solid, there is a problem with your fuel economy system. For example your gass cap may be loose. Another cause could be if you changed your tires to a different size that is not recommended for the make and model.
If it is blinking then you have a problem with your ignition system. For example you may have a misfiring spark plug.
If you read your owners manual all the warning lights are explained in detail. If you do not have your owners manual then I recomend that you buy one and keep it in your glove box. It will also tell you how to reset your change oil light after you do and oil change, so it will track it properly for you.
Wiki User
∙ 9y ago
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check cat converter if it has 75000 miles or more
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Check the fuses first
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First check the fuses.
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Why is your 2003 Chevy Trailblazer missing?
Take it to a local PepBoys they can scan if you have a check engine light on and from there I can help you more with diagnosing a misfire incase you have multiple problems
How do you reset check engine light soon on 2003 Chevy trailblazer?
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check fuse
