I was driving down the road 3 weeks ago or so and my oil pressure gauge was all over the place. Everything got real tight . Noing that the oil pump in these cummins engine's are a beast,SENDING UNIT FAIL.The only oil pump fail I have seen was a marine engine with a fram filter on it..

Scanned for codes and produced a PO523=Oil Pressure Sensor High

Went to the cummins dealer and picked up a new oil pressure sender part#4921511.This part number is determined by the engine code plate that is on the side(Drivers Side) of the gear case. To take the old unit out I used a 1 1/4 inch socket to remove the sender (On the driver side under the cummins ECM). For the install the new sender was a 27mm deep.

I hope this helps out and here are some pics.

 

more pics

 

Thanks turbo20psi I need to replace mine too and now I know where it is.
-=Greg=-
98.5 Dodge Cummins 3500 Duallie, Auto, remote trans cooler w/fan, 4" Turbo back SS Exhaust, BHAF, Superchips Tuner, more, with 3000 lbs. BigFoot 11' Camper in the bed.

 

Thanks for the write up! I'll be copying this into the Tech Threads.

 

what did you pay. i went to dealer and they told me 360$ i fainted and wonder if there is other way to go.

 

Go directly to a Cummins Dealership, or any parts store should have them. The parts store may not carry a genuine Cummins part, but it will work.

 

geno's are the cheapest, and there a genuine cummins part.

CUMMINS OIL PRESSURE SENSOR ('98.5-'02, 24V)-Dodge Cummins Diesel Truck Accessories – Geno’s Garage