How to: Change Oil Pressure Sending Unit / Switch

How to: Change Oil Pressure Sending Unit / Oil Pressure Switch

Recently, while at a hot idle, the oil pressure light on my dash began to flicker. Being that my car was recently bought, is almost 10 years old, and is a tad of 98k miles, I did an oil change. This was the first oil change done under my ownership. The top end of the engine was rebuilt when I bought it at 96k miles and the bottom ended has no unusual noises.

However, I experienced the same results after an oil change, so this led me to believe that the oil pressure switch / sending unit maybe the culprit. AND IT WAS. So here is a little write-up for you guys before I forget certain stuff.

1. Raise car with jack or place on ramps. If using a jack, please use jack stands. Always use parking brake and wheel chocks.
2. OPTIONAL Remove splash shield on passenger side, front tire wheel well (10mm socket needed). (Personally, I placed the car on ramps and removed the shield from under the car without removing the tire. If you raise the car with a jack, you are better off removing the front tire. You can change sensor without removing the splash shield, but it just makes it easier in my opinion.
3. Locate the switch on the rear of the engine block, just above the oil pan. The switch will be on the block nearest to the P/S tire. Remove electrical connector. See attached picture. Switch is circled in red (photo is not mine, credit is due to member "Daox")
4. Remove switch from engine block by rotating counter clockwise with a 15/16" open-ended wrench. A small amount of oil will spill out, so have an oil pan or container at the ready. An open ended wrench or specifically made oil switch socket is need as the electrical connector on the switch will not allow a regular socket or deep socket to fully seat.
5. Replace with new oil switch. I used a Duralast #PS437 from Autozone. Apply a small amount of RTV gasket maker to the threads and thread new switch into block with hands-only first. After it is hand tight, using a wrench, give it another 1/4 - 1/2 turn or until you feel resistance. Reconnect electrical connector.
6. Start car and let it run for a few minutes. Look to see that switch is secured and that no oil is leaking.
7. Re-install splash shield, lower car, have a beer.

Experience level: Very easy, easy, medium, hard, very hard
Approx time: Start to finish 10-20 min
Tools needed: Socket wrench, 10mm socket, open ended 15/16" wrench, RTV gasket maker

View image below for location of oil pressure switch.

Attachment 8541

If you have any questions, feel free to post in the thread or PM me.

PS- from my limited experiences on AveoFoum, I see that many people on this site are not mechanically inclined, especially compared to other boards I am on such as Jeepforum, LS1Tech, FastLSX, etc. For a job like this, you can buy the tools yourself and do the job yourself in your own driveway and it will still be cheaper than dropping it off at a repair shop. Do this a few times with other jobs, and instead of paying your mechanic, you in turn build yourself a decent collection of tools that can be used for an assortment of things.

That's a great write-up! Thanks! Aveoforum could use more of these. Agreed on doing some of these items yourself. It's crazy how this $10 part would somehow end up costing you $200 if you took it in.

Great write up. :)

Thank you for that information, I am not sure what year that was for but the engine in my 09 Aveo LT has the oil pressure switch in the front of the engine.

Quote:

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Originally Posted by lenty

Thank you for that information, I am not sure what year that was for but the engine in my 09 Aveo LT has the oil pressure switch in the front of the engine.

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Where at in the front? I've been looking all over.

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Do you think it's possible to T off of this spot. Have the idiot light on one side and run a machanical pressure gauge out the other side.

Quote:

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Originally Posted by lenty

Thank you for that information, I am not sure what year that was for but the engine in my 09 Aveo LT has the oil pressure switch in the front of the engine.

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I found my switch...finally in the front just line you said. Now...what needs to come off to get to it? Have you replaced yours?

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I'm new at this forum. Maybe if I use "quick reply" kind of looking for some help now!!

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This post was really helpful. My 09 was a little more difficult to change than just simply disconnecting the sensor wire and removing the old unit. With the unit being on the front of the engine you have to be a little more mechanically inclined. In my case we had to remove the AC compressor unit to access my sensor. Not terribly hard but its not for the amateur first timer. After that i just followed the steps outlined in the original post. Hope this helps. Tools needed: 12mm DEEP socket and a 12in or longer ratchet for the AC unit. 14mm box end for the tensioner to remove the belt. 10mm socket for the undercarriage shield. 15/16th open end wrench for the sensor. Oil pressure sensor ran me $23 at autozone. Gasket maker $6 at Walmart.

Thank you so much for this post.

2009 Aveo5 LS
Not sure what's up but, finally found oil pressure sensor in front under the exhaust manifold. No connection to, or even just laying there not connected. Nothing on the OBDII though about code. Stumped.