engine

Oil Level Sensor

for 1994–2007 Dodge Ram 2500 5.9L I6 Cummins Diesel · 4WD

Difficulty

Easy

Time

1.4 h

Tools

Steps

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This procedure covers the removal and replacement of the oil level sensor on the 5.9L Cummins diesel engine, which monitors engine oil level and alerts the driver to low oil conditions.

Warnings

⚠Perform this repair with the engine cold to avoid burns from hot oil and components

⚠Oil will drain from the sensor location when removed; have a catch pan ready

ℹ️The oil level sensor is located on the driver's side of the oil pan on the 5.9L Cummins

Tools required

Oil drain pan (capacity 15 qt minimum)Essential

Torque wrench (10-50 Nm range)Essential

Socket set (metric)Essential

Ratchet and extensionsEssential

Flat-blade screwdriver (for connector release)

Shop ragsEssential

Nitrile gloves

Catch container for oil spillageEssential

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Parts

Oil level sensor × 1 — Cummins OEM or equivalent
O-ring seal for sensor × 1 — Usually included with sensor

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Fluids

15W-40 diesel engine oil — 1 qt

Preparation

Park vehicle on level ground and engage parking brake
Allow engine to cool completely (minimum 2 hours after operation)
Raise and support vehicle on jack stands at appropriate lift points if additional clearance is needed
Place oil drain pan beneath the oil level sensor location on driver's side of oil pan
Disconnect negative battery cable to prevent false fault codes during sensor replacement

Procedure

1
Locate Oil Level Sensor
Identify the oil level sensor on the driver's side of the oil pan. The sensor is a cylindrical component with an electrical connector on top, typically located near the front-middle section of the pan.
2
Disconnect Electrical Connector
Press the release tab on the electrical connector and pull it straight away from the sensor. If connector is difficult to remove, use a flat-blade screwdriver to carefully depress the locking tab while pulling the connector. Inspect connector terminals for corrosion or damage.
3
Position Drain Pan
Position your oil drain pan directly beneath the sensor. Expect approximately 0.5-1 quart of oil to drain when the sensor is removed, depending on current oil level. Have shop rags ready to contain spillage.
4
Remove Oil Level Sensor
Using the appropriate socket (typically 22mm or 7/8 inch), carefully loosen and remove the oil level sensor by turning counterclockwise. Once loose, quickly remove by hand and allow oil to drain into pan. Keep sensor upright after removal to minimize spillage.
⚠Oil will flow from the opening once sensor begins to loosen; work quickly to minimize spillage
5
Clean Sensor Bore
Once oil has finished draining, clean the sensor mounting bore in the oil pan using a shop rag. Remove any old gasket material, debris, or sludge from the threads and sealing surface. Inspect threads for damage.
6
Inspect and Prepare New Sensor
Remove new oil level sensor from packaging. Verify that the O-ring seal is properly seated in the sensor groove. Lightly lubricate the O-ring with clean engine oil to aid installation and prevent damage during threading.
7
Install New Oil Level Sensor
Thread the new sensor into the oil pan bore by hand, turning clockwise. Ensure sensor threads in smoothly without cross-threading. Once hand-tight, use torque wrench to tighten to specification.
Torque spec
Oil Level Sensor15 Nm (11 lb-ft)
8
Reconnect Electrical Connector
Push the electrical connector onto the new sensor until you hear or feel a positive click, indicating the locking tab has engaged. Gently tug on the connector to verify it is securely locked.
9
Check and Top Off Engine Oil
Reconnect negative battery cable. Start engine and let idle for 30 seconds, then shut off. Wait 5 minutes for oil to settle, then check oil level with dipstick. Add 15W-40 diesel engine oil as needed to bring level to FULL mark on dipstick.

Reassembly

Ensure electrical connector is fully seated and locked onto sensor
Lower vehicle from jack stands if raised
Dispose of drained oil properly at recycling center

Verification

Start engine and verify no oil leaks from sensor location after 1-2 minutes of idle
Check instrument cluster to confirm oil level warning light functions properly (should illuminate with key on/engine off, then extinguish after startup if oil level is adequate)
Road test vehicle and verify no oil level warning messages appear on instrument cluster
Re-check oil level after first drive cycle and confirm no leakage beneath vehicle