Volvo/Mack MP8 DPF Differential Pressure Sensor Housing Bolts
The MP8 DPF differential pressure sensor measures pressure drop across the DPF to determine soot load and trigger regeneration. Proper sensor housing torque ensures the pressure tubes seal correctly. Loose pressure tube connections cause false DPF pressure readings and missed regeneration events.
Important: These torque specs are reference values. Always verify against your OEM service manual for your specific engine serial number and build date. Torque-to-yield bolts must be replaced — never reused.
Torque Specifications
| Step | Torque Value | Notes |
|---|---|---|
| Sensor Housing Mounting Bolts | 9 ft-lbs (12 Nm) | Use new gasket. Torque in a cross pattern. |
| DPF Pressure Sensor (if threaded) | 18 ft-lbs (24 Nm) | Apply anti-seize to sensor threads. |
| Pressure Tube Fittings | 9 ft-lbs (12 Nm) | Use new O-rings on pressure tube fittings. Verify tubes are not kinked or plugged. |
Related Fault Codes
Click any fault code to open the AI Diagnostic Engine for guided troubleshooting.
Frequently Asked Questions
What is the torque spec for Volvo/Mack MP8 DPF pressure sensor housing bolts?
MP8 DPF pressure sensor housing bolts torque to 9 ft-lbs (12 Nm) in a cross pattern with a new gasket.
What is the torque for MP8 DPF pressure tube fittings?
MP8 DPF pressure tube fittings torque to 9 ft-lbs (12 Nm) with new O-rings.
What causes false DPF pressure readings on the MP8?
False DPF pressure readings are commonly caused by loose pressure tube fittings, kinked or plugged pressure tubes, or a failed sensor.
What fault codes are related to MP8 DPF pressure sensor issues?
Common related fault codes include SPN 3719 FMI 0 (DPF pressure above normal), SPN 3719 FMI 2 (DPF pressure erratic), and SPN 3719 FMI 15 (DPF pressure above normal — moderate).