Mazda Error Code P1406: How to Fix It

Q: What causes Mazda P1406 error code?

The P1406 code is caused by a disconnected, cracked, or blocked downstream hose on the DPFE sensor. This can happen due to age, heat damage, carbon buildup, or improper maintenance of the EGR system.

Q: Can I drive with P1406 code?

While you can drive short distances with this code, it's not recommended for extended periods. The vehicle may experience rough idling, reduced fuel economy, and will likely fail emissions testing. Address the issue promptly to prevent potential damage to other emissions components.

Q: How much does it cost to fix P1406?

If it's just a loose or blocked hose, the repair can cost $50-150 for labor. If the DPFE sensor needs replacement, expect $150-300 total. More extensive EGR system repairs can cost $300-600 depending on the components needed.

Q: Will P1406 cause my car to fail inspection?

Yes, the P1406 code will typically cause your vehicle to fail emissions testing in states that require it. The code must be resolved and the monitors must complete their drive cycles before passing inspection.

Q: How do I prevent P1406 from happening again?

Regular maintenance of the EGR system, using quality fuel with detergents, and replacing the air filter as scheduled can help prevent carbon buildup that leads to blocked hoses. Having the EGR system inspected during major services can catch issues early.

Abstract

The P1406 error code in Mazda vehicles indicates that the DPFE (Differential Pressure Feedback Electronic) sensor's downstream hose is either disconnected or plugged. This sensor monitors exhaust gas recirculation and helps control emissions. When this error occurs, your vehicle may experience rough idling, reduced fuel economy, or fail emissions testing.