The check engine light indicates the computer has found a fault and stored a fault code. Many auto parts stores will pull the code for free and tell you what may be causing the issue.
With a scan tool.
No
In US it says "SERVICE ENGINE SOON" in Canada it looks like an engine.
I had all sensors replaced in my 03 Trailblazer and the check engine light stiil comes on. Why?
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.
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.
I think you are talking about the secondary air check valve. Come to our enthusiasts forum and post your question there with the trouble code (Pxxxx) www.trailvoy.com All the Answers for your Trailblazer
A few weekends ago I had to replace the fan clutch on my '06 Trailblazer EXT LS. In addition to getting the P0495 code from the check engine light, when I rev'd it up it sounded like a jet engine. Instructions: http://www.diystew.com/2006-trailblazer/
The diagnostic code 410, on your 2004 Chevrolet trailblazer, is a reference to a vacuum hose problem. Check the vacuum hoses to make sure they are all connected.
Check the fuel injectors
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.
There are many reasons why a check engine light could come on and shut a Trailblazer off. It could be the fuel pump or the oil pump. A mechanic will be able to run diagnostic tests to figure out the problem.