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So just recently I had the P0520 code for the oil pressure switch / sensor. On my 2007 XK hemi it is located up behind the oil filter. I bought a new unit from Advance and bought their 1 1/16" special socket for removing these sensors. Well, I wanted all to know that socket does not fit. I went back and exchanged it for a regular 27mm deep socket which fit perfectly. It's actually a pretty simple job to do with relatively good access. Just make sure you have a long extension and one of those swivel adapters since it's not completely a straight line to get to.
 

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A fairly common failure - I just replaced it on my Hemi. The oil pressure sensor on the Hemi's if bad can cause all different kinds of DTC codes as the 5V circuit to several other sensors runs through this sensor. I have heard about all kinds of problems with aftermarket sensors failing in a very short time. When mine failed my Jeep stopped dead with many different codes relating to cam and crankshaft position sensors as well as throttle position problems. Strangely it never showed a failure of the pressure sensor itself. I think if the sensor fails and the circuit goes to ground it effects the 5V circuit to the other sensors. If the failure mode does not go to ground it shows as a failed oil pressure sensor without the associated other DTC codes. Though the OEM sensors do fail they do last for a good while so I would be careful about using an aftermarket sensor. The oil pressure sensor on the Hemi is in fact not a simple switch as most oil pressure switches are other vehicles.
 

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Its a pretty common failure on most Chrysler vehicles, and most aftermarket oil pressure gauges as well. Every Autometer electric Oil Pressure Gauge I have owned (and I have had several) needed a new pressure sender every 5 years or so. I haven't owned enough other brands over the years, to know, but I imagine the switches eventually wear out on them as well.
 
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