How To Replace Downstream Oxygen (O2) Sensors - Chevy Trailblazer (Andy’s Garage: Episode - 422)

Andy Phillips shows how to access and replace both downstream oxygen sensors on a Chevy Trailblazer EXT with the GM 5.3L V8. This particular vehicle has four oxygen sensors, two upstream and two downstream.

Below are links to other videos of mine pertaining to the Trailblazer:

How To Replace Camshaft Position Sensor:    • How To Replace Camshaft Position Sens...  
How To Replace Oil Pressure Sensor - GM 5.3L V8:    • How To Replace Oil Pressure Sensor - ...  
Replace Knock Sensors on 5.3L V8:    • How To Replace Knock Sensors - GM 5.3...  
Replacing Intake Manifold Gaskets - Chevy Trailblazer:    • How To Replace Intake Manifold Gasket...  
How To Replace A Valley Pan Gasket:    • How To Replace Valley Pan Gasket - GM...  
Replacing Catalytic Converters:    • How To Replace Catalytic Converters -...  
Replacing Valve Stem Seals:    • How To Replace Valve Stem Seals - Che...  
How To Replace Cylinder 2 Spark Plug:    • How To Replace Cylinder 2 Spark Plug ...  
Valve Cover Gaskets:    • How To Replace Valve Cover Gaskets - ...  
Replacing Rear Shocks on a Chevy Trailblazer:    • How To Replace Rear Shocks - Chevy Tr...  
Front Sway Bar Bushings:    • How To Replace Front Sway Bar Bushing...  
Front Stabilizer Links - Chevy Trailblazer:    • How To Replace Front Stabilizer Links...  
Front Struts - Chevy Trailblazer:    • How To Replace Front Struts - Chevy T...  
Replacing Throttle Body - Chevy Trailblazer:    • How To Replace A Throttle Body - Chev...  
Replacing Power Steering Pump - Trailblazer:    • How To Replace A Power Steering Pump ...  
A/C & Tensioner Belt Replacement - Trailblazer:    • How To Replace The A/C & Tensioner Be...  
Replacing Serpentine Drive Belt on a Trailblazer:    • How To Replace A Serpentine Drive Bel...  
Removing A Radiator Cooling Fan:    • How To Remove Radiator Cooling Fan - ...  
How To Align Headlights On A Trailblazer:    • How To Align Headlights - Chevy Trail...  
How To Replace Brake Light Bulbs - Chevy Trailblazer:    • How To Replace Brake Light Bulbs - Ch...  
Tail Light Removal - Chevy Trailblazer:    • How To Remove And Replace A Tail Ligh...  
How To Change A PCV Valve on a Chevy Trailblazer:    • How To Change The PCV Valve - Chevy T...  
How To Remove A Trailblazer Fuel Tank:    • How To Remove The Fuel Tank - Chevy T...  
Replacing The Fuel Pump Assembly:    • How To Replace Fuel Pump Assembly - C...  
Changing The Fuel Filter on a Chevy Trailblazer:    • How To Change A Fuel Filter - Chevy T...  
Replacing Ignition Coil Packs on a Chevy Trailblazer:    • How To Replace Ignition Coil Packs - ...  
Fuel Pressure Regulator:    • How To Replace A Fuel Pressure Regula...  
Replacing Fuel Injectors:    • How To Replace Fuel Injectors - Chevy...  
How To replace An Air Filter - Chevy Trailblazer:    • How To Replace Air Filter - Chevy Tra...  
Removing Trailblazer Glove Box:    • How To Remove Glove Box - Chevy Trail...  
How To Replace HVAC Blower Motor Resistor On Trailblazer:    • How To Replace HVAC Blower Motor Resi...  
How To Replace An Alternator On Trailblazer:    • How To Replace Alternator - Chevy Tra...  
Changing Oil & Filter On Trailblazer:    • How to Change Oil - Chevy Trailblazer...  
Cleaning Throttle Body & MAF Sensor On Trailblazer:    • How To Clean Throttle Body & MAF Sens...  
Changing Brakes:    • How To Change Brakes - Chevy Trailbla...  
Replacing Windshield Wipers On Trailblazer:    • How To Replace Windshield Wipers - Ch...  
Removing Wheel Well Liner On Trailblazer:    • How To Remove Wheel Well Liner - Chev...  
Replacing Upper Control Arm On Trailblazer:    • How To Replace Upper Control Arm - Ch...  
Changing Front Tie Rods On Trailblazer:    • How To Replace Front Outer Tie Rod - ...  
Wheel Hub Assembly & Bearing Replacement - Chevy Trailblazer:    • How To Replace Wheel Hub Assembly & B...  
Brake Booster Replacement On Trailblazer:    • How To Replace A Brake Booster - Chev...  
Replacing Spark Plugs & Cables - GMC 5.3L V8:    • How To Replace Spark Plugs & Ignition...  
Replacing Turn Signal Bulbs On Trailblazer:    • How To Replace Turn Signal Bulbs - Ch...  
How To Replace Side Marker Bulbs On Trailblazer:    • How To Replace Side Marker Bulbs - Ch...  
Headlight Bulb Replacement On Trailblazer:    • How To Replace Headlight Bulbs - Chev...  
Turn Off Change Engine Oil Light On Trailblazer:    • How To Reset CHANGE ENGINE OIL Light ...  
Checking Fuel Pressure - GM 5.3L V8:    • How To Check Fuel Pressure - GM 5.3L ...  
Fixing Faulty Spare Tire Mechanism:    • How To Fix Spare Tire Mechanism - GM ...  

DISCLAIMER:
The individual featured on the Phillips Vision YouTube Channel identified as Andrew Phillips, also known as Andy Phillips is not a professional mechanic, contractor or certified repairman. He does not have any formal training in the automotive field, or any other trade. He is strictly a Do It Yourself handyman.

Phillips Vision, or the individuals featured on this channel, assume no liability for anything you choose to do to your vehicles, appliances, games or any other items featured in the videos before, or after watching one of the videos or utilizing the content from this channel.

All Do it Yourself (DIY) repairs or modifications you perform are at your own risk. Proper safety precautions are always needed, and are the responsibility of the viewer to follow. In some cases, even if you perform everything properly, you can destroy or damage one or more things you are working on resulting is costly repairs.

In addition, if for some reason, the instructions on this channel are incorrect, resulting it something becoming damaged, Phillips Vision and those featured on this channel WILL NOT reimburse or pay in any way the costs that may be incurred due to following wrong instructions.

PLEASE DO NOT PERFORM ANYTHING SHOWN ON THIS CHANNEL (PHILLIPS VISION) UNLESS YOU FEEL COMFORTABLE AND CONFIDENT TO DO SO.