EGR Temperature Sensor Circuit Malfunction (Nissan) / DPFE Sensor Circuit High (Ford)
What does P1401 mean?
The P1401 code means the vehicle's onboard diagnostic system has detected: EGR Temperature Sensor Circuit Malfunction (Nissan) / DPFE Sensor Circuit High (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Rough idle or engine surge
- Failed emissions test
- Engine knock or ping under load
- Slight reduction in fuel economy
Probable Causes (Ranked by Likelihood)
- Failed DPFE sensor (Ford) or EGR temperature sensor (Nissan) Very High
- Clogged or cracked DPFE hoses (Ford) High
- Carbon-clogged EGR system Moderate
- EGR valve stuck open Moderate
- Damaged wiring to EGR sensor Low
Step-by-Step Diagnostic Procedure
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Test the DPFE sensor or EGR temperature sensor with a scan tool
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Inspect DPFE hoses for cracks, clogs, or disconnection (Ford)
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Clean the EGR valve and passages of carbon buildup
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Check the wiring and connector at the EGR sensor
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Replace the DPFE sensor if it reads out of range
Frequently Asked Questions
Can I drive with code P1401?
You can drive short distances. The vehicle will likely fail an emissions test. If the EGR valve is stuck open, you may experience rough idle and reduced performance.
What causes P1401 on Ford?
The DPFE sensor is one of the most commonly replaced parts on Ford vehicles. The sensor and its rubber hoses deteriorate over time, causing erratic EGR readings.
Is P1401 cheap to fix?
Usually yes. The DPFE sensor (Ford) costs $30 to $80 and is easy to replace. The hoses are also inexpensive. Total repair cost is typically $50 to $200.