3967251 Oil Pressure Sensor for Cummins T 6BT 3.9 ISB QSB B 5.9 E

The 3967251 Oil Pressure Sensor is a common part used in several Cummins diesel engines, including the 4BT, 6BT, 3.9L, ISB, QSB, and 5.9L (B-series) engines. This sensor monitors engine oil pressure and sends the data to the vehicle’s ECM or oil pressure gauge.

Key Details:

• Part Number: 3967251 (may also be superseded by newer numbers)

• Compatible Engines:

  • Cummins 4BT (3.9L)

  • Cummins 6BT (5.9L)

  • ISB & QSB series

  • B-series engines

Fit certain Dodge Ram trucks equipped with the Cummins 5.9L (6BT) or later ISB/QSB diesel engines. Here’s what you need to know:

Compatible Dodge Ram Models:

• 1994–1998 Dodge Ram 2500/3500 (5.9L 12V Cummins 6BT)

• 1998.5–2002 Dodge Ram 2500/3500 (5.9L 24V Cummins ISB)

• 2003–2007 Dodge Ram 2500/3500 (5.9L Cummins ISB, some early QSB)

Key Notes:

1. Location: The sensor is usually near the oil filter housing or on the engine block.

2. Electrical Connector: Early models (12V) may have a different plug style than later (24V) models—verify before ordering.

3. Aftermarket Alternatives: Some aftermarket sensors (like Standard Motor Products PS446) are direct replacements.

Check Before Buying:

• If your Ram has a mechanical gauge, it may use a different sender.

• Later 6.7L Cummins (2007.5+) Rams use a different sensor.

Symptoms of a Failing Oil Pressure Sensor:

• Erratic oil pressure gauge readings (fluctuating or zero reading)

• Check Engine Light (CEL) with oil pressure-related codes

• False low oil pressure warning (even when oil level is correct)

• No oil pressure reading on the gauge

Replacement Tips:

1. Location: Typically found near the oil filter housing or on the engine block.

2. Installation: Use a proper socket or wrench to avoid damaging the sensor.

3. Thread Sealant: Some sensors require thread sealant (check manufacturer specs).

4. Torque: Do not overtighten (usually around 10-15 ft-lbs).

Possible Cross-Reference/OEM Alternatives:

• Cummins OEM: 3967251, 3415505, 4026287 (updated part numbers)

• Aftermarket Brands: Standard Motor Products, Delphi, Bosch