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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