That is known as non sustainable development.
you have or should have two oxygen sensors on exhuast pipe. one before catalytic converter and one after it.depending on which engine you have you usually can see the one closest to engine from under hood.second one " SAFELY" jack up car and look just past catylitci converter should see it easily.
You will need to check the dash controller to make sure that it is operating correctly first for both sides..............
Turn the ignition over without starting it, push the gas pedal down all of the way three times within 5 seconds, The light will flash indicating you were sucessful, turn ignition to off this locks the reset then start your car and the light should go off. If this does not work, repeat procedure. This worked on 2003, 2004, 2006 envoy, and is suppose to work on all year models.
Also check your GMC owners manual under systems management.
It is on the intake air tube facing the firewall close to where the tube joins the Vortec 4200 resonator box. All the answers are at our enthusiasts website ........
www.trailvoy.com
Depends on the garage door opener you have. For the most part hold the button on the visor until it flashes fast, or slow, Just so you see the light change. Then hold the button on you garage door remote next to the visor until the light on the visor changes again. This should do it. Now if you have a rolling code garage door opener then you need to locate the learn button on the garage door opener motor. Press the learn button until it changes and then run to your car and press the visor button until you see the light on the garage motor hold steady. Good luck.
Also, try www.homelink.com
The abs light is on because there is a problem with the abs system. The light will remain on until the problem is fixed. Once the problem is fixed the light will reset itself after a short drive.
The check engine light can be reset by disconnecting the battery for a few minutes. If it comes on again you should get the codes read with a OBDII reader. Autozone or another parts supply chain will usually do it for free. The codes are stored on board the PCM and will tell you where your vehicle is having a problem.
If the check engine light ever flashes then it is a do not drive situation.
www.trailvoy.com All the answers for your trailblazer and more!
At 100,000 miles or 160,000 kilometres you change the spark plugs. www.trailvoy.com All the answers for your Envoy/Trailblazer from true enthusiasts!
The blower motor is behind the glove box. 3 screws below the glove box to expose the glove box bracket then 2 more to take the glove box off.....its big and silver...cant miss it!
We have detailed instructions at our enthusiasts forum for door panel removal. They detail speaker replacement and mirror turn signal replacement.
www.trailvoy.com
thermostat is located behind the alternator on the drivers side bottom hose 2 bolts and the thermostat and aluminum is one peace cost is around $50.00 at NAPA