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Performance Upgrades - Maintenance - Modifications - Problem Solving - Off-Road - Street Trucks. Covering the Explorer, ST, Sport, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar. Featuring H.I. - Human Intelligence.
My 2002 XLT 4.0L has the "Service Engine Soon" light illuminated. I am not having any noticeable performance issues. Upon searching the forums and following the advice given I went to AutoZone where they hooked up and gave me the OBDII (Alpha) P Code of P0401 and P1401. 401 say the PCM...
