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What is code p1152 on a Ford Expedition?

The P1152 code, or "HO2S Insufficient Switching Bank 1 Sensor 2," indicates in your 2004 Ford Expedition's powertrain control module (PCM) has identified low oxygen switching activity for the rear oxygen (O2) sensor mounted inside the driver side's exhaust manifold. When the PCM's programming detects that the heated oxygen sensor downstream does not switch between its rich (.2v) and lean (.8v) voltage signals over a particular number of trips, the PCM sets a diagnostics trouble code P1152 and turns on the MIL on your Expedition's dash.
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