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Help...getting Obd2 Code P1154!

1864 Views 1 Reply 2 Participants Last post by  FJB20
2005 GMC Sierra with long tube headers. Rear O2 Sensors were disabled with a Nelson's Tune. Now 2 years later I'm getting this code P1154.
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So change all 4 sensors and drive it for 100 milkes and be done with it
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