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Welcome to our channel! If you've scanned a P219C In this video, we explain the P0121 P2621 | p2621 Throttle Position Output Circuit Low | A heavy duty diesel truck violently shaking with a strong smell of raw fuel in the cab usually points directly to a P020C diagnostic ... Facing a rough idle or a major loss in performance can be incredibly frustrating for any owner, so here is how to fix P021D
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