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The QX4 code P0158 refers to a problem with the oxygen sensor circuit, specifically indicating a high voltage signal from the downstream oxygen sensor (Sensor 2) of bank 2. This typically suggests that the sensor may be malfunctioning, there could be a wiring issue, or a potential exhaust leak affecting the sensor readings. It is essential to diagnose the specific cause to ensure proper vehicle performance and emissions control.

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4mo ago

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