P1407 EGR Metering Orifice Restricted
The P1407 code indicates that the EGR (Exhaust Gas Recirculation) valve's metering orifice is restricted. This calibrated orifice controls the precise flow of exhaust gases into the intake. A restriction prevents the EGR valve from properly regulating recirculation flow, causing the PCM to detect insufficient or unstable flow compared to expected values for operating conditions. The system monitors EGR flow using differential pressure sensors or valve position sensors, depending on the vehicle application.
01. Most Common Causes
- Carbon buildup in the EGR valve metering orifice
- Stuck EGR valve stem due to deposits
- Partial blockage in EGR passage tubes
- Faulty EGR position sensor (EVP/EGRP) providing incorrect readings
- Malfunctioning EGR control solenoid or actuator
- Damaged EGR valve diaphragm (on vacuum-controlled models)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
03. Step-by-Step Diagnosis
Scan for codes and verify P1407 is present
Inspect EGR valve and passages for carbon buildup; clean if necessary
Test EGR valve operation using a scan tool or vacuum pump
Check EGR position sensor and control solenoid for proper function
1. Frequently Asked Questions
Is it safe to drive?▼
Yes, but you may experience reduced performance and fuel economy. Have it diagnosed soon to prevent further issues.
How much does it cost to fix?▼
Typically $150 to $400, depending on whether cleaning or replacement is needed.