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What Does P0071 Code Mean?

    OBD-II Code P0071 is defined as a Ambient Air Temperature Sensor Range/Performance

    The ambient temperature sensor helps the engine control module (PCM) determine how much fuel to use on startup. The PCM also uses this signal as a logic reference for other temperature sensors on the engine. If the PCM detects an issue with the signal from this sensor, it will set code P0071.

    P0071 Symptoms

    • Hard engine start

    Common Problems That Trigger the P0071 Code

    • Ambient air temperature sensor failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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