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What is the meaning of OBD-II p0406 code , and what are the possible causes and how to solve this issue?

OBD-II code P0406 refers to a fault in the Exhaust Gas Recirculation (EGR) Sensor A Circuit High Input. Possible causes for this issue are: Failed EGR sensor Wiring issues in the EGR sensor circuit Failed PCM or BCM Clogged EGR valve or passages To solve this issue, the following steps should be taken: Verify the fault code with a OBD-II scanner Check for any loose, damaged or corroded wiring in the EGR sensor circuit Replace the EGR sensor if it is found to be faulty Clean or replace the EGR valve if it is clogged If the problem persists, further diagnosis and repair may be necessary, including replacing the PCM or BCM. It's important to note that a professional mechanic should diagnose and repair this issue, as it requires specialized tools and knowledge to safely diagnose and repair the vehicle.

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