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Re: Volvo 850 oil pressure sending unit
It's on the engine, right next to the starter, it has one wire going to it. You don't need to drain the oil. If the light is coming on, you may have bad seals in the oil pan, a fairly common problem, but replacing the switch is a good fisrt step.
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It's the map sensor ( manifold absolute pressure) I don't have my manual at the moment, so I can't tell you exactly where it is. There should be an emissions sticker under the hood somewhere showing the location of it.
to much crankpressure can be caused by a couple of things....a clogged PCV valve(cheapest) or compression blow-by at the piston rings ( most expensive) you need to have a cylinder leak down test performed...that will tell you where the problem is
it's generally located near or on the housing for the oil filter. you shouldn't need to drain the oil... just clean off any dirt around the sensor before you replace it... and yes i know this is very obvious to most people but i have to mention it whether i want to or not... this is done with the motor off.
per the Haynes manual for the 95-05 Dodge Stratus on the 2.0L & 2.4L DOHC 4 cyl engines, the oil pressure sending unit is located at the left end of the rear side of the block. On 2.4L SOHC 4 cyl engines, the sending unit is located at the left end of the rear side of the block. On 2.5L & 3.0L V6 engines, the sending unit is located on the oil filter housing, on the front side of the block. On 2.7L V6 engines, the sending unit is located at the left end of the rear side of the block. To access it, remove the heat shield.