P0404 OBD-II Trouble Code: Exhaust Gas Recirculation Circuit Range/Performance

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Cost of diagnosing the P0404 code

P0404 is a diagnostic trouble code (DTC) for "Exhaust Gas Recirculation Circuit Range/Performance". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
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P0404 code definition

Exhaust Gas Recirculation Circuit Range/Performance

What the P0404 code means

P0404 is an OBD-II generic code that the engine control module (ECM) detected the engine exhaust gas recirculation (EGR) valve or sensor is out of specification range or its performance has gone out of specification parameters.

What causes the P0404 code?

  • The ECM monitors the EGR position with a sensor mounted on top of the EGR valve and the valve was out of a set position when the EGR was commanded closed.

  • The EGR valve movement should be smooth without jerking or the ECM sets the code.

  • The EGR sensor went above upper limits when the EGR was commanded open by the ECM.

What are the symptoms of the P0404 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory.
  • The engine may have pre-ignition on acceleration.
  • The engine EGR system can cause the engine to run rough, hesitate or even stall if it is not indicating the proper EGR valve position to the ECM.

How does a mechanic diagnose the P0404 code?

  • Scans codes and documents the freeze frame data in order to verify the problem

  • Clears the engine codes and road tests to verify if the concern comes back

  • Monitors the EGR sensor pid on a scanner to see if sensor indicates the valve is stuck open or not moving smoothly

  • Removes the EGR sensor and manually operate the sensor to isolate a valve or sensor failure

  • Removes and checks the EGR valve to verify it is not carboned up, causing the bad sensor readings.

Common mistakes when diagnosing the P0404 code

  • Not operating the EGR position sensor manually to isolate a valve or sensor failure before replacing components

  • Not checking the wiring harness and connection to the EGR position sensor for problems before replacing the EGR position sensor or EGR valve

How serious is the P0404 code?

  • An EGR system that triggers this code the ECM may disable the EGR system and render it inoperative.

  • The Check Engine Light being on causes the vehicle to fail emission testing.

  • The EGR position is critical for the ECM to properly control EGR valve opening and closing.

What repairs can fix the P0404 code?

  • Replacing the EGR valve if it stuck partly open from carbon buildup in the pintle area and cannot be cleaned.

  • Replacing the EGR position sensor if it is determined that it cannot give a correct input reading to the ECM when moved manually

  • Repairing the wiring that is shorted or open to the EGR position sensor or connector

Additional comments for consideration regarding the P0404 code

Code P0404 is triggered when the EGR position is not as the ECM expected and the most common cause is the EGR valve partly stuck open from carbon buildup on the valve pintle.

Need help with a P0404 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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Honorio

16 years of experience
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Honorio
16 years of experience
Excellent customer service. Wish all your mechanics were the same
2010 BUICK ENCLAVE - CHECK ENGINE LIGHT IS ON - PALO ALTO, CALIFORNIA

Stefan

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Stefan is very knowledgable and thorough fixing my car. This my second time using Your Mechanic with Stefan as my mechanic, and I couldn't be more pleased. I have recommended this company to all my friends. You will not be disappointed making your next appointment with Your Mechanic, and having Stefan working on your car.
2007 MERCEDES-BENZ ML350 - CHECK ENGINE LIGHT IS ON - WALNUT CREEK, CALIFORNIA

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He showed up on time and got my diagnostic done quickly. He also gave me honest recommendations on what I need to do for my car.
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Tien

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Prompt and professional. Tien contacted me earlier in the day to let me know he could arrive earlier than my original appointment if I desired. He conducted a thorough inspection, identified the reason for my check-engine-light warning - and then he sent me two separate quotes for repairs. That's the only reason I'm not giving five stars, because I had to make an appointment for those repairs to be done and it's not clear that all the repairs will be done at the same time because I received two separate email quotes and could only make an appointment for one. (I certainly hope so!) I've had a lot of adventures over the years with this old truck. If Tien can keep her running happily, I will be delighted to use his services again.
1999 TOYOTA TACOMA - CHECK ENGINE LIGHT IS ON - ALAMEDA, CALIFORNIA

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