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How do you clean a clogged egr valve

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How do you clean a egr valve on a 07 Mitsubishi galant I am getting a trouble code p0401

Vehicle: 2007,Mitsubishi,galant,2.4liter

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P0401 EGR gas flow insufficient detected

You may not have to clear out the EGR valve there is a TSB about this situation titled MIL on DTC set P0401 set in ECM. TSB # 10-13-006 this is about reprogramming the EGR valve judgement criteria

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