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code P0401 is an EGR code. which is insufficient EGR (exhaust gas recirculation) flow.it is quite common for people to just replace the EGR valve.
You can try doing it your self.:---- To troubleshoot these issue and solve it yourself.I suggest you to go through few help links related to OBD code P0401:----- Click the link below:-----
Hi, check harness and connector betwen thermistor and control PWB. clear the error code by using SIM 14 if all didn't work you may have defective AC power supply
If it blows thru other vents, your air ducts may have come loose. If you don't get any cool air, your coolant is low (it evaporates during the time and below some point it will not circulate anymore). Also the aircon blower can be faulty.
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