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The truck came to my shop with the engine running very rough if only warmed ready. It had been updated less than 6 months prior. Used to notice brand new alternator were being installed with out by my opinion. I remembered the customer had said to me he was on vacation a month ago along with it installed because it failed while on a trip. I inspected both primary and secondary ignition system for signs of failure. Scalping systems checked out fine. I hooked up my scan tool to retrieve any service codes, there where none. I ran both a "key on engine off" and "key on engine running" self tests with my scanner. No codes where retrieved. Next, i went to data stream mode and observed the critical engine control inputs and components. All readings appeared normal except for your upstream O2 sensors |
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