SureTrack Community Real Fix: Nissan DPF Un-Sensored

Real Fixes from the SureTrack® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is currently available free with the purchase of a current Snap-on® diagnostic software version.

2015 Nissan Qashqai 1.5L Diesel

P0471, Replaced Diesel Particulate Filter Pressure Sensor

The customer states the check engine light is on.

Connected a scan tool and found code P0471 – Exhaust Pressure Sensor “A” Circuit Range/Performance. At idle, used the scan tool to monitor live data and found the diesel particulate filter (DPF) pressure sensor signal parameter was erratic. Using a lab scope, backprobed the DPF pressure sensor signal circuit at the control module and found the signal parameter was erratic, which indicated there was a fault in the sensor or circuitry.

Used a multi-meter to check for the presence of a short or open in the diesel particulate filter pressure sensor wiring harness and found there were no shorts or opens present. Disconnected the DPF pressure sensor connector, visually inspected the connector and terminals, and found no obvious signs of damage. Visually inspected the diesel particulate filter pressure sensor pipe and found no obvious signs of damage. Used the multi-meter to measure the resistance of the DPF sensor and found the measured resistance was not within specifications. The results of these tests verified the diesel particulate filter pressure sensor was faulty.

Replaced the diesel particulate filter pressure sensor, cleared codes, performed a road test, and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.

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About the Author

Abagail Lucero

Abagail Lucero is the Product Marketing Manager for ProDemand. She joined the company in 2011 as a member of the SocialCRM shop marketing team and has served in many roles at Mitchell1, lastly as Security and Compliance Supervisor. Abagail holds a Bachelor of Science degree from California University of Pennsylvania.