[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

The 02-09 "How-To" and DIY Section Threads on Do-It-Yourself and How-To goes here.

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Old 05-20-2012, 04:34 PM
Ohiobucks Ohiobucks is offline
Junior Member
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.

  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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Old 10-25-2012, 03:04 PM
rolandvz71 rolandvz71 is offline
2002 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 2WD
Join Date: Feb 2008
Location: Houston
Posts: 113
Oil sending unit

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