P1402 Code: Meaning, Symptoms, Causes & Fix

Overview

Symptoms

• failed emissions test readiness
• rough idle under load
• check engine light

Common causes

• Control module logic or calibration issue affecting egr metering orifice restricted
• Component failure in the monitored system
• Connector pin damage/corrosion or harness stress near related components

How to diagnose P1402

1. Confirm P1402 and capture freeze-frame data with a professional scan tool.
2. Inspect wiring, connectors, and grounds related to egr metering orifice restricted for obvious defects.
3. Use freeze-frame and live data to isolate whether the issue is electrical, mechanical, or control logic.
4. Check for related DTCs to identify the root-cause chain before replacing parts.
5. After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1402

Low: This code is low to moderate severity in most cases, but diagnosis is still recommended to avoid recurring warnings.

Can you drive with P1402?

The vehicle is often drivable with P1402, but plan a repair window to prevent repeat faults.

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

How to fix it (step-by-step)

1. Repair obvious wiring/connector faults first to prevent repeat parts replacement.
2. Address the root fault mode (generic) in the egr metering orifice restricted circuit/system.
3. Apply the required relearn/adaptation procedure if specified by service information.
4. Road-test and verify P1402 remains cleared under the conditions that originally set the code.

Fix options

• Test component operation and replace if faulty.
• Inspect circuit and connector condition.
• Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$120-$500

Common mistakes when diagnosing P1402

• 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.

P1402 in common vehicles

P1402 appears across makes such as Mazda, Subaru, Lexus, Jeep. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1402?

P1402 is commonly set by generic faults affecting egr metering orifice restricted.

How much does it cost to fix P1402?

For P1402, repair costs are typically $120-$500 depending on exact root cause, labor rates, and part quality.

Can I clear P1402 without repair?

You can clear P1402 temporarily, but the code usually returns until the underlying fault is corrected.

Helpful tools

• Estimate repair cost
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