Can you tell me exactly where the front 2 Oxygen sensors are located on a 2003 Trailblazer EXT V8? How hard are they to get to?
Thanks.

 

Welcome to the forum.
The front O2 sensors are just ahead of the cats, and rear O2 sensors are just behind the cats.

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I have located the front 02 sensors but I am having trouble getting to the connections. Does anyone have any ideas on an easy way to get to the connectors? Thank you.

 

Get the correct size wrench and unscrew them from the exhaust pipe. According to the service manual it is easier if the pipes are at 120*F, anything cooler might result in thread damage etc., etc., etc., yada yada yada....

I do believe that the warmer the parts are the easier they will be to remove so get as close to that temp and wear protective gloves so not to burn yourself from the heat...

 

I don't know if this is the case with your connectors, but with some I have had to unclip the the harness to lower it enough to access the connectors.