2006 Jeep Grand Cherokee P0152 O2 Sensor High Voltage Code: Causes and Solutions

The P0152 oxygen sensor high voltage code occasionally appears on a 2006 Jeep Grand Cherokee during initial cold starts or when backing out of the driveway with a cold engine. The issue tends to resolve after 3 to 4 engine restarts and does not reappear for 2–3 months. It has also been triggered during short drives, especially when transitioning into a driveway on a slight incline—a scenario that has repeated multiple times. All oxygen sensors have been replaced twice without resolving the intermittent occurrence of the MIL illumination or the P0152 code. The vehicle passes local smog tests with no fuel-rich or lean readings after clearing the code, indicating proper air-fuel mixture under normal conditions. With 60,000 miles on the odometer and low fuel economy (approximately 11–12 mpg), the vehicle is equipped with a lift and 35" tires geared to 4.88:1. Despite the P0150 code being present, there are no noticeable performance issues, and the stored code can be erased without immediate recurrence. Before disconnecting the ECM connectors for wiring diagnostics, what other potential factors could contribute to this momentary fault during cold starts? Are there known sensor-related or electrical interference sources in the 2006 Jeep Grand Cherokee that might trigger a P0152 code under specific driving conditions?