2001 Mazda B3000 EGR Codes

2012 MAZDA TRUCK
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DANH
  • MEMBER
  • 2 POSTS
Over the past 10K miles my 2001 B3000 Mazda truck with 95K miles continues to give me EGR failure codes. These codes are both 401 & 402, to much and to little EGR. I have tested and cleaned both the EGR valve and solenoid, both check good. The vacuum lines and pressure both appear good. After a code reset the check engine light will remain off for a day or so. The emissions are good and gas millage is always 21-22 MPG and truck is excellent in all other ways. The check engine light is running me crazy.
Is there any advise on this problem ?
Jan 23, 2007 at 1:35 AM
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COSMO
  • ✓Experienced Mechanic
  • 347 POSTS
Yuo require the replacement of the DPFE sensor. It is the little black or silve box with two hoses going to the RS exhaust manilfold.

They are very common. also make sure those two hoses are ok


Cosmo...Mazda TEch
Jan 23, 2007 at 3:38 AM

Suggested Repair

Replace the DPFE sensor (the small black or silver box with two hoses to the exhaust manifold) and confirm those two hoses are in good condition.

Conversation Summary

A 2001 Mazda B3000 with about 95,000 miles repeatedly sets EGR codes for both too much and too little flow (P0401 and P0402). The owner cleaned and tested the EGR valve and solenoid, found vacuum lines and pressure apparently good, and reports normal emissions, mileage, and drivability, but the check engine light returns soon after a reset. The expert recommends replacing the DPFE sensor and checking the two hoses that run to the exhaust manifold.

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