Guide To P0407 OBD Error Code Solutions

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The P0407 code is due to a voltage issue with the EGR system. Here the signal which is being sent from the circuit to the engine computer is generally low and it not within the manufacturer’s specifications.

The error code P0407 can be defined as Exhaust Gas Recirculation Sensor B Circuit Low.

Willing to learn more about the P0407 error code? The components of the Exhaust Gas Recirculation system are EGR Valve, Engine Control Module Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Modulator. It is the ECM which would control the EGR Solenoid depending on the engine and driving conditions. The opening and closing of the EGR valve is regulated by the EGR Vacuum Modulator.

What causes this problem with the Exhaust Gas Recirculation Sensor B Circuit Low?

• Ground short in the EGR circuit
• The EGR vacuum solenoid might be defective
• Quirks in the EGR valve
• There can be a voltage short in the EGR circuit
• Bad wiring from the engine control unit to EGR system
• Defects in the engine control unit

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2. Air Intake temperature Sensor - A broken Air Intake temperature Sensor can cause a lot of issues. It would be nice if you get it replaced on time.
3. EGR Valve Gasket - Everything is fine with the engine control module and still OBD code P0407 flashing? Then there is definitely some fault with the EGR Valve Gasket. Get it checked and replace if needed.
4. Crankshaft Position Sensor - Crankshaft Position Sensor is an important car part which should never be neglected. May be there is some fault in it due to which P0407 code may start flashing.
5. Powertrain Control Module - A faulty Powertrain Control Module can be troublesome. You can always rely on us as we have best auto parts for our customers.
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We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P0407. They are mentioned here as follows:

Common Symptoms

• Flashing up of the service engine soon warning light
• The car engine might start hesitating

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0407:

• Clean the EGR valve, clear the code and monitor for it to return
• Inspect the voltage and ground – repair wiring as per the requirement
• You must try to clear the code with a scanner and monitor for the code to return
• It is very important to visually check the EGR valve and associated wiring and vacuum lines for any obvious issues
• Repair the vacuum lines to the EGR and EGR solenoid
• Force the solenoid to trigger on and off to check if it is working properly
• The damaged EGR valve should always be replaced

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Do you wish to diagnose P0407 error code easily? Here are some steps which you should follow in order to diagnose this fault code:

A professional OBD-II scanner should be used by a mechanic to typically monitor the EGR valve and see if it responds to feedback i.e. opens and closes. If it does, it might indicate that there is need to clean the valve. This can be done by removing the valve usually near the exhaust and or intake manifold and spraying carburetor cleaner and using a small brush.

By reinstalling the valve, clearing the code, and driving the vehicle with a scan tool connected, a mechanic can monitor to see if the valve operates any differently as a result of the cleaning. If not, a multimeter will help determine if the valve is getting the 5 volts it needs for a reference and feedback circuit. If there are some faults in the wires, then there is definitely a need to replace them. If all of this check out, the solenoid should be next. This can be tested by unplugging the output vacuum line and triggering the EGR valve to open. An audible tick should be heard from solenoid. If not, it may need to be replaced. If the solenoid is working properly though, then there are chances that the EGR valve is defective.

Common Mistakes When Diagnosing The P0407 Code

• Keep this in mind that the P0407 trouble code does not always trigger up due to faulty EGR valve and it can turn out to be very expensive if you will replace it
• The wiring as well as solenoid should be tested first as they are the least expensive components rather than replacing the valve directly
• Always make sure to keep your parts clean as it would be less expensive than replacing the entire components