Ambient Air Temperature Sensor Circuit
The P0070 code means the vehicle's onboard diagnostic system has detected: Ambient Air Temperature Sensor Circuit. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $30 - $200 (parts and labor)
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What Are the Symptoms of P0070?
- Check Engine Light illuminated
- Incorrect outside temperature display on dashboard
- HVAC automatic climate control may not function correctly
- Slight changes in fuel mixture adaptation
What Causes P0070? (Most Likely First)
- Faulty ambient air temperature sensor Very High
- Damaged wiring or connector to sensor High
- Sensor mounted near heat source causing incorrect readings Moderate
- PCM/ECM malfunction Low
Can I Still Drive with P0070?
Yes, but fix soon. P0070 is rated low severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
Can I drive with a P0070 code?
Yes, this code does not significantly affect driveability. The engine may have minor fuel mixture adjustments, but the vehicle is safe to drive.
Where is the ambient air temperature sensor located?
It is typically mounted behind the front bumper, in front of the radiator, or inside the side mirror housing. Check your service manual for the exact location on your vehicle.
Can a bad ambient air temperature sensor affect fuel economy?
In most cases the effect is minimal. The PCM uses this sensor primarily for cold start enrichment calculations, so fuel economy impact is usually negligible.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0070?
-
Read ambient air temperature PID with a scan tool and compare to actual outside temperature using a thermometer.
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Locate the ambient air temperature sensor (usually behind the front bumper or grille area). Inspect the connector for corrosion or damage.
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Test sensor resistance with a multimeter: typical range is 10k ohms at 32F (0C) and 2k ohms at 77F (25C). Compare to manufacturer specs.
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Check wiring continuity from the sensor connector back to the PCM. Repair any open or shorted circuits.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0070?
- 2010-2020 Ford F-150
- 2012-2019 Chevrolet Cruze
- 2008-2018 Toyota Corolla
- 2011-2020 Hyundai Sonata
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