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Mazda B2500 Pickup P1401 Code Explanation: What Does DPFE Sensor Circuit High Input Mean?

Model: Mazda B2500 Pick Up Fault Code: P1401 Posted: 2007-07-09 14:44

I'm looking for a clear explanation of the P1401 diagnostic code on my 1998 Mazda B2500 pickup. The code is 'DPFE Sensor Circuit High Input'. I have a 4.2L 4-cylinder engine with a manual 5-speed transmission and approximately 36,000 miles on the odometer. Could someone please explain what this code means, what the DPFE sensor does, and where it's located in the vehicle? Any technical details or troubleshooting tips would be greatly appreciated.

Related fault codes

P1401

Comments (4)

Anonymous 2007-07-09 15:25

The P1401 code on Mazda B2500 pickups often relates to the Diesel Particulate Filter Efficiency (DPFE) sensor, which monitors exhaust gas flow. A 'high input' reading typically indicates a fault in the sensor circuit or an issue with the intake system. This is not always caused by a failed sensor—mechanical issues or wiring problems can also trigger it.

Anonymous 2007-07-09 15:30

Yes, you can search the forum using keywords like 'Mazda B2500 P1401' or 'DPFE sensor fault' to find relevant discussions and solutions.

Anonymous 2007-07-09 15:32

Correct—using specific terms such as 'P1401 Mazda B2500' will help you locate detailed posts from owners who have faced the same issue.

Anonymous 2007-07-09 16:10

Thanks! I'll try searching for 'Mazda B2500 P1401 DPFE sensor' to find more user experiences and repair steps.