Volvo D13 DPF Delta Pressure Sensor | OEM 21403962

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The ZTech Volvo D13 DPF Delta Pressure Sensor (21403962 / 23488881) measures the pressure differential across the diesel particulate filter to determine soot loading and trigger active regeneration cycles. Accurate delta pressure readings are essential for DPF health — a faulty sensor causes missed regenerations leading to DPF clogging, or unnecessary regenerations wasting fuel and shortening DPF service life. ZTech sensors provide OEM-level accuracy for proper DPF management.

Q: Which trucks does this DPF pressure sensor fit?
A: Fits Volvo VNL trucks with D13 engines. Replaces OEM part numbers 21403962 and 23488881.

Q: What fault codes does a failing DPF delta pressure sensor trigger?
A: Common codes include SPN 3251 (particulate matter trap differential pressure) faults in Volvo VCADS.

Q: What happens if the DPF delta pressure sensor fails?
A: The aftertreatment system loses the ability to accurately monitor DPF soot loading, leading to missed regenerations, DPF clogging, and potential DPF replacement.

Q: Is this OEM or aftermarket?
A: ZTech is a European aftermarket sensor manufacturer calibrated to Volvo D13 OEM specifications.

Q: What is included with this sensor?
A: Includes the complete DPF delta pressure sensor assembly with connector and mounting hardware, ready for installation.