P1405 moderate

EGR System Upstream Hose Leak (Ford)

Can I Drive?
Yes, But Fix Soon
DIY Difficulty
easy
Estimated Cost
$100 - $500 (parts and labor)

What does P1405 mean?

The P1405 code means the vehicle's onboard diagnostic system has detected: EGR System Upstream Hose Leak (Ford). This is a moderate severity code.

Common Symptoms

  • Check Engine Light on
  • Rough idle
  • Engine hesitation
  • Failed emissions test

Probable Causes (Ranked by Likelihood)

  • Carbon buildup in EGR valve or passages Very High
  • Faulty EGR valve or solenoid High
  • EGR position sensor or temp sensor failure Moderate
  • Vacuum line leak or wiring fault Low

Step-by-Step Diagnostic Procedure

  1. Inspect EGR valve for carbon buildup

  2. Test EGR solenoid/motor operation

  3. Check EGR position or temp sensor

  4. Inspect vacuum lines and wiring

Frequently Asked Questions

What does the EGR system do?

EGR recirculates a portion of exhaust gas back into the intake to reduce combustion temperatures and NOx emissions.

Can I clean the EGR valve?

Yes. Carbon buildup is the most common cause of EGR issues. Cleaning with carburetor cleaner often resolves the problem.

Will a bad EGR affect performance?

Yes. A stuck open EGR valve causes rough idle and stalling. A stuck closed valve increases emissions and may cause pinging.

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