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P0070 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


DTC stands for diagnostic trouble code, a standardized system used to communicate and identify potential malfunctions in vehicles. A special DTC code with respect to ambient air temperature sensors is P0070.


A circuit failure with the ambient air temperature sensor is specifically indicated in this code P0070. It is the responsibility of this sensor to measure the air temperature around the vehicle. The vehicle’s computer will be able to adapt various systems, e.g. the air-fuel mixture of an engine, in order to optimize performance and fuel efficiency when it monitors external temperatures.


The P0070 code may be activated for a variety of reasons, such as:

  • Ambient air temperature sensor malfunction: The sensor itself may be faulty or damaged, resulting in false readings or a full breakdown.
  • Wiring Problems: The sensor’s circuitry may become hampered by frayed or corroded wires, loose connections, or short circuits.
  • Placement of the Sensor: The P0070 error code may be shown if the sensor is positioned incorrectly or is exposed to the elements.
  • Problems with the Electronic Control Module (ECM): When the vehicle’s primary computer experiences difficulties, the signals from the sensors are interpreted incorrectly, which activates the code.


When the P0070 code is triggered, you may experience the following symptoms:

  • Illuminated Check Engine Light: The most common indicator of a trouble code is the activation of the vehicle’s Check Engine Light.
  • Inaccurate Ambient Temperature Reading: The vehicle’s display may provide incorrect or erratic outside temperature readings.
  • Adverse Engine Performance: Depending on the severity of the issue, you might notice reduced engine performance, decreased fuel efficiency, or other drivability problems.


To diagnose the P0070 code accurately, a professional automotive technician will typically perform the following steps:

  • OBD-II Scanner: Using an onboard diagnostic scanner, the technician will retrieve the trouble code and any related codes stored in the vehicle’s computer.
  • Visual Inspection: A thorough visual inspection of the AAT sensor and its wiring will be conducted to identify any visible signs of damage, corrosion, or loose connections.
  • Sensor Testing: The technician will test the sensor’s resistance, voltage, and temperature readings using a multimeter or specialized tools.
  • Circuit Testing: The wiring and circuitry associated with the AAT sensor will be examined for continuity, shorts, or open circuits.
  • ECM Analysis: If necessary, the technician will analyze the ECM’s data to determine if any other issues contribute to the code’s activation.

Common mistakes

Common mistakes that could lead to incorrect diagnosis or repair should be avoided in relation to the P0070 code:

  •  Neglecting basic checks: In certain cases, it may be the missing connector or broken wire that is the root cause of this problem, so a comprehensive visual examination must be performed prior to performing more complicated diagnostics. 
  • Ignore related codes: While a P0070 may represent the primary code, it is possible that there are other ones stored in an ECM that can provide valuable clues about the underlying problem. If the related codes are ignored, there is a risk of incomplete repairs.
  • Skipping OEM Recommendations: In order to correctly and effectively resolve the P0070 code, it is necessary to comply with the manufacturer’s guidelines on diagnostic procedures, repair, or replacement of parts.

How serious is this?

The specific circumstances and vehicle type of the code P0070 have a large bearing on its seriousness. The code may only cause occasional inconveniences, for example, a failure to obtain accurate temperature readings. Without addressing this question, however, there might be a deterioration in engine performance, decreased fuel efficiency, or possible damage to the rest of the components. In order to avoid any additional complications, it is recommended that the code be addressed as soon as possible.

What repairs can fix the code?

repair manuals

Once the root cause of the P0070 code is identified, the following repairs may be necessary:

  • AAT Sensor Replacement: If your sensor is not functioning, it should be replaced by a new, correct sensor in order to resolve the problem. 
  • Wiring Repair: Repairing damaged or corroded wires, ensuring proper connections, or replacing the wiring harness may be required to restore the sensor’s functionality.
  • ECM repair or replacement: It may be necessary to repair or replace the computer in rare cases where the ECM causes the problem.

Related codes

There are several related codes that may be associated with the P0070 code, including:

  • P0071: Ambient Air Temperature Sensor Range/Performance
  • P0072: Ambient Air Temperature Sensor Circuit Low Input
  • P0073: Ambient Air Temperature Sensor Circuit High Input

These related codes may provide additional insights into the underlying issue and assist in the diagnostic process.


A vehicle’s performance and fuel efficiency can be affected by the P0070 DTC code for an ambient air temperature sensor. You are in a position to deal effectively with this problem, by knowing its nature, causes, symptoms, diagnosis and treatment procedures, commonly occurring errors, seriousness, possibilities for repairs, or associated codes. 

Contacting a professional automotive technician is advised if you encounter the P0070 code or suspect an issue with your ambient air temperature sensor. Prompt diagnosis and appropriate repairs will help ensure your vehicle operates optimally and reliably in varying weather conditions.

P0070 Code – What Does It Mean & How To Fix It