Tip & How-To about Chevrolet TrailBlazer

Check engine light.

When ever you have a check engine light on the first thing to do is to have the computer scanned for codes, these codes will help in finding the problem, when ever the engine or trany or emmisions component fails the computer knows and stores a code or codes and then turns the light on, by scanning the computer and getting the codes, these code will tell you where the problems are with a code #, then with some diagnosing you can pin point the problem. to get the codes a scan tool is needed but most autopart stores will scan and give you the codes for free. so always start with the codes.

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servic eengine light stays on


The first thing you need to do is to have the computer scanned to see what codes are stored in the computer, the computer is always scanning the engine and sensors looking for defective readings and when it sees a bad sensor reading it will turn on the check engine light and store a code with the definition of the problem, the first step is to go an auto parts store that will scan the computer for free and see if they will give you a free print out of the codes or you can write them down, write me back with the codes and i will try to help you solve the check engine light , good dayl.

Oct 05, 2012 | Buick Cars & Trucks

1 Answer

i have a problem with the oxygen sensor the check engine light goes on but i changed both oxygen sensors and the check engine light still appears


The check engine light can come on for over 150 things, from a sensor to a loose gas cap, you will need to have the codes scanned, the computer stores codes when it detects something not working correctly,there are many auto part stores that will scan it for free and give you a print out of the codes, if you can give me the codes i could help you find out why the engine light is on, good day.

Apr 10, 2011 | 1998 Acura CL

2 Answers

i got a vaccum hose loose and check engine light is on with funny noises


The first thing is to have the computer scanned for the codes, when the check engine light is on there will be codes to help find the problem it may be related to the vacuum hoses but get the codes first, i know that autozone parts store will scan the codes for free so start there. hope this helps.

Sep 04, 2010 | 2000 Nissan Maxima

1 Answer

I have a 2005 Smart fortwo. Then engine light just came on. I am wondering what would cause this. My husband has checked the oil & prestone level and both are fine...HELP!!!


When the check engine light comes on its to tell you something is wrong,like a bad sensor or other emmsion controls, there are many reasons for light to come on like 50 to 75 diffrent things can make light come on, you will need to have the computer scanned for codes,when ever the light comes on the computer stores codes of why it was turned on, these codes will help in finding the problem, there are autopart stores that will scan it for free and give you the codes, if you get the codes i could help a little more, start with getting the codes, also as long as the light is not flashing your not causing any damage but should be checked. hope this helps.

Sep 04, 2010 | 2008 Smart fortwo

2 Answers

2005 Toyota Corolla the engine light came on then the transmission started changing hard. It all happened suddenly. What could be the problem?


Engine light came on, due to computer pick up a bad signal, from one of your engine or transmission sensor's, have a code reading done, most auto parts will do this for free, get back with us with the trouble code number, so we can help you diag. it, hope this was very helpful.

Aug 27, 2010 | 2005 Toyota Corolla

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