[SOLVED] How To - Oil Pressure Sensor Replacement - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > The 02-09 "How-To" and DIY Section

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  #1  
Old 05-20-2012, 04:34 PM
Ohiobucks Ohiobucks is offline
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2005 Chevy TrailBlazer LT
Blue and Silver 4.2L I6 4X4
Join Date: Aug 2010
Location: Erie, pa
Posts: 6
How To - Oil Pressure Sensor Replacement

I got word from a friend who works at a dealership that 2 TB's came in recently with seized engines where the oil pressure switch/sensor rotted out and the engine lost oil. Decided that this oil change would be a good time to change out the oil sensor.

2005 Trailblazer, 4.2 I-6

Location of sensor: 2" above the oil filter.
Tools needed: 1 1/16" 6 pointed deepwell socket. Note: the oil sending unit/switch specialty socket that "fits most sensors" from Advanced and Autozone did not fit the sensor i had.
Time Required: ~5 Minutes if coordinated with oil change.
Level of difficulty: If you can change your oil, you can do this.

With the oil filter removed, and accessing the sensor from underneath, unclip the wire connected to to the sensor. I was able to squeeze a 1/2" ratchet and the 1 1/16" socket onto the sensor to break it loose and then unscrew by hand. Screw in the new sensor and connect the wire. Done.

Notes:
  1. as stated above the specialty socket for oil pressure sensors that fit 1" up to 1 1/16" did not fit this sensor.
  2. The sensor that came up in the computer for the 05 trailblazer was incorrect from Advanced Auto. I had to go back and return the sensor after removing the existing sensor and realized they were not the same. The correct sensor was for a 2003 TB in their system after comparing the sensor i brought in.
  3. Nothing had to be disconnected and removed if you access the sensor from underneath as you would change the oil + filter.

Good luck.
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  #2  
Old 10-25-2012, 03:04 PM
rolandvz71 rolandvz71 is online now
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2002 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 2WD
Join Date: Feb 2008
Location: Houston
Posts: 112
Oil sending unit

OK so with that said where is the oil sending unit.....or are they the same thing?
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