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So i have a 2003 6s, with 85000 miles on it. i do have an injen intake, but have never had a CEL and its been on the vehicle since 2004 and 7000 miles. So i've had lean faults for about 4-6 months now. first i found an intake leak, then the pcv valve and hose faulty, then plugs failed, now the oxygen sensors have been replaced due to failure an di've cleaned the MAF meter. i am only getting P0174 now, but my emissions are due and im at a loss. i am a technician and have found no other leaks, what could it be? does anyone have a stock air box or spare MAF meter that i cvould use to test if my intake has taken 6 years to finally set a fault. thanks
 
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