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Had change mine recently,it is located under the manifold near the firewall.Dealer wanted about 600.00 to replaced,looked in search section for DIY repair a took about 30 min.Cost about 50.00.
Ok searched around here on the forums and it seems like the oil temperature sensor is integrated with the oil "LEVEL" sensor located on the bottom of the engine oil pan...
So... this means I need to drain oil, change sensor... replug, refill???
The rock auto part looks closer to factory than the other one, do a search in the performance/tech area for Oil temp sensor and go to post #14 there is a pictures of the sensor in the side of the pan, it looks like the rock auto part, but kind of hard to tell without seeing the whole part. You may want to buy one from the dealer, just to be sure it's correct, Good Luck
Why not get a quote from Gene Culley at GM PartsHouse or Kevin Cassimore at PartsTaxi, both forum vendors, for the factory GM OEM part? Both of 'em have good pricing and great service.
The Oil Pressure Sensor...
is near the upper firewall on the driver's side of the engine block.
Only need to remove the valve cover plastic cover to remove and have a sensor installation socket.
The Oil Level Sensor...
also measures the temp.
This sensor is located on the oil pan under the starter.
Advised to drain oil before replacing.