P1407 — EGR Metering Orifice Restricted

Is it safe to drive with P1407?

Generally safe to drive in the short term. Expect rough idle, pinging and higher emissions; on some cars the engine may derate. If the engine stalls or runs very rough, treat it as urgent.

Will P1407 clear itself?

Sometimes P1407 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What are the symptoms of P1407?

Drivers most often notice: rough idle or stalling at idle, increased NOx emissions, slight power loss, Check Engine Light on.

What does OBD2 code P1407 mean?

OBD2 code P1407 flags a problem with the exhaust gas recirculation (EGR) system (EGR metering orifice restricted). The car is usually drivable while you plan the repair. Common culprits: carbon buildup blocking the EGR valve or passages, faulty EGR solenoid or wiring, vacuum leaks in EGR control lines.

What is the most common cause of P1407?

The most common causes are: carbon buildup blocking the EGR valve or passages, faulty EGR solenoid or wiring, vacuum leaks in EGR control lines.

When your scan tool pulls code P1407, the engine computer has detected that the exhaust gas recirculation system is behaving outside its expected parameters. Specifically, this code flags a restriction in the EGR metering orifice — the small opening that controls how much exhaust gas gets fed back into the intake. EGR reduces combustion temperatures to lower harmful NOx emissions, and when that flow is blocked or restricted beyond what the ECU can compensate for, P1407 triggers. The fault falls under the powertrain category, meaning it involves the engine management system rather than chassis or body electronics.

The ECU sets P1407 after monitoring EGR operation across multiple drive cycles and comparing live sensor data against factory calibration values. It doesn't flag a one-time hiccup — the system needs to see a consistent pattern of improper operation before lighting up the check engine lamp. When the code stores, the PCM also captures a freeze frame snapshot: engine RPM, load percentage, coolant temperature, and vehicle speed recorded at the exact moment the fault was detected. That snapshot is invaluable during diagnosis because it tells you exactly what conditions triggered the problem.

Common Symptoms of P1407

The EGR system's job is to lower combustion temperatures, and when it can't do that properly, you'll notice the downstream effects. Here is what to watch for with P1407 stored:

• Check Engine Light illuminated on the dashboard
• Rough or unstable idle, sometimes stalling when the engine is warm
• Noticeable hesitation or spark knock (pinging) when accelerating under load
• Mild loss of engine power during normal driving
• Elevated NOx emissions, which may cause failed emissions testing

What Causes P1407

Several different failures can produce the same P1407 code. The most frequent culprits tend to be the simplest to address, so work through this list in order:

• Carbon deposits blocking the EGR valve seat, pintle, or the narrow metering orifice in the intake manifold
• Cracked, disconnected, or leaking vacuum hoses that feed the EGR vacuum regulator
• Wiring damage — chafed insulation, corroded terminals, or broken connections in the EGR control circuit
• A faulty EGR solenoid or vacuum control valve that fails to regulate EGR flow
• A failed EGR valve or integrated position sensor that no longer responds to commands
• In rare cases, an ECM software calibration issue or internal control circuit fault

How to Diagnose P1407

A systematic approach prevents unnecessary part swapping and wasted money. Follow these steps to confirm the root cause before replacing components:

1. Connect an OBD2 scanner and verify that P1407 is the only stored code (or note related codes that may point to the real problem). Save the freeze frame data and reproduce those exact operating conditions during your road test.
2. Inspect all vacuum lines, electrical connectors, and wiring related to the EGR system. Look for cracks, disconnections, corrosion, or broken wires — these are quick fixes that sometimes solve the problem entirely.
3. Use the scanner to command the EGR valve open and closed while monitoring the position sensor feedback. The valve should respond smoothly across its full range; stiction or dead zones indicate carbon binding.
4. Remove the EGR valve from the intake and physically inspect the valve and the passages leading to it. Heavy carbon buildup on the pintle, seat, or orifice is the most common finding.
5. Clean the valve and passages with a dedicated EGR cleaner, reinstall, and clear the code. Drive the vehicle through a complete drive cycle under the conditions captured in the freeze frame and recheck for P1407.
6. If the code persists after cleaning and visual inspection, test the solenoid and wiring with a multimeter according to manufacturer specs, and consider software updates or TSBs for your specific make and model.

Repair Options and Costs

Once you have identified the problem, repair costs vary depending on which component failed:

• Vacuum line or wiring repair: $80–$250
• EGR valve and passage cleaning: $120–$350
• EGR valve replacement: $250–$650

All prices reflect typical parts and labor at an independent repair shop in USD. Expect to pay on the lower end if a cleaning resolves the issue, and toward the higher end if a full valve replacement is necessary.

Total Cost to Fix P1407

In most cases, addressing P1407 will run between $80 and $650 depending on the repair path taken. Cleaning the carbon buildup costs the least and resolves the majority of these codes. Replacing the EGR valve is more expensive but becomes necessary when the valve itself is physically damaged or the position sensor has failed. Spending time on a proper diagnosis before purchasing parts is the best way to avoid paying for a $650 repair when a $120 cleaning would have fixed it.

Can You Drive with P1407?

This fault is generally considered safe to drive in the short term. You may experience rough idling, occasional pinging under acceleration, and higher emissions output. On certain vehicles, the engine may enter a reduced-power mode if the ECU detects severe EGR malfunction. If the engine stalls frequently or runs so rough that it feels unsafe, treat it as urgent and have it diagnosed promptly. Otherwise, schedule the repair at your earliest convenience to restore proper emissions control and drivability.

Related OBD2 Codes

• P1400: Glow Plug Monitor Fault (Bank #1)
• P1401: Glow Plug Monitor Fault (Bank #2)
• P1402: System Voltage Out Of Self Test Range
• P1403: VVT Solenoid B Circuit High Input
• P1404: Glow Plug Circuit High Side
• P1405: DPFE Circuit Low Input