P1407 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P1407 indicates a fault in EGR No Flow Detected, typically within emissions and air-fuel control.

Symptoms

increased fuel consumption
check engine light
rough idle under load

Common causes

Signal pulled low by short-to-ground affecting egr no flow detected
High circuit resistance
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1407

Confirm P1407 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to egr no flow detected for obvious defects.
Compare live data against expected lower threshold and verify ground/reference circuits.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1407

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P1407?

Most vehicles can be driven short-term with P1407, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (low) in the egr no flow detected circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1407 remains cleared under the conditions that originally set the code.

Fix options

Repair connector resistance issues.
Replace failed sensor if signal remains low.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$180-$900

Common mistakes when diagnosing P1407

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

P1407 in common vehicles

P1407 appears across makes such as Ford, Toyota, Honda, Chevrolet. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1407?

P1407 is commonly set by low faults affecting egr no flow detected.

How much does it cost to fix P1407?

For P1407, repair costs are typically $180-$900 depending on exact root cause, labor rates, and part quality.

Can I clear P1407 without repair?

You can clear P1407 temporarily, but the code usually returns until the underlying fault is corrected.