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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.
Hi everyone! I’m going to attempt to replace the O2 sensors on my sister-in-law’s ‘03 Explorer 4.0L. The dealership used a code reader and advised that the bank 1 & 2 O2 sensors were bad. I don’t have the code. I’m wondering if those are upstream sensors or downstream? Also, I have never...
