What causes low EGR flow?

What causes low EGR flow?

Clogged EGR passages. Faulty EGR valve. A failed sensor (e.g., differential pressure sensor, manifold absolute pressure sensor, etc.) Inadequate vacuum supply to the EGR valve.

Is it safe to drive with P0401 code?

Hi There, Code P0401 relates to the EGR valve flow. When this code is triggered, the computer has detected that the flow is insufficient. Driving the car until next week will not cause any harm, although the vehicle may not run well.

What are P0401 symptoms?

Symptoms of Code P0401

• Check Engine Light.
• Failed emissions test.
• Slower acceleration.
• Ignition pinging.

What is the P0401 code?

Code P0401 Meaning EGR valves can malfunction by becoming stuck open or closed due to carbon buildup. This is likely due to faulty or clogged EGR valve or carbon buildup in the intake manifold or on the EGR temperature sensor.