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Hey Guys, Think I have a bad oil pressure sensor-throwing code P0521. Need help in locating it in the engine. Anybody know where this sensor is in the engine? Got a new one to install -can't find the darn thing! Thanks! Indyrob
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If it's like most 5.3L then it'll be on top of the valley cover/engine block, toward the back of the engine. If you cannot get to it easily then you will have to take the intake manifold off. If there turns out to be some leakage of oil then it is highly recommended to do some type of sealing procedure since the newer truck engines are known to have this problem. I don't remember if you do need a special tool, but it would be wise to look it up.
if it's like most 5.3l then it'll be on top of the valley cover toward the back of the engine. If you cannot get to it easily then you will have to take the intake manifold off. If there turns out to be some leakage of oil then it is highly recommended to do some type of sealing procedure since the newer truck engines are known to have this problem. I don't remember if you do need a special too, but it would be wise to look it up.
thanks for the info. I'm gonna try to replace it saturday. The dealer said they would do it for $150 but i can't see how if that manifold is coming out. Might just do it myself. Thanks again. Indyrob
You might be able to get to it without taking the manifold off, but if it's too hard then you'll have to take the manifold off. This might be why you would need a special tool (in order to make this procedure easier). Can't really say, other than me seeing the sensor on the rear of the valley cover or engine block (top) on some 5.3L's. I didn't really pay attention to whether or not the sensor was under the intake manifold or right past it. Hopefully it's right past it. Good luck.
hello, i have tahoe with 5.3 in it. the oil pressure switch is behind the intake minifold on top of block. its not fun getting to. hard to unplug the wire. the retaining clip is tough. 1 1\16 deep thin wall socket., a swivel socket and couple of extensions and you should get it. the service book says to take the manifold off (its a book). you can get to it. this r and r should fix the high and low readings of your gauge. i did even have a message center reading of low oil pressure and thats because of the gauge. never mind the stepper motors others talk about. the cheapest and quickest will be this fix. good luck
Last edited by tahoefamily; 12-20-2011 at 08:42 PM.