P0070 low

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.

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Keep driving?: Yes, but fix soon
DIY difficulty: easy
Estimated cost: $30 - $200 (parts and labor)

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Common Symptoms

Check Engine Light illuminated
Incorrect outside temperature display on dashboard
HVAC automatic climate control may not function correctly
Slight changes in fuel mixture adaptation

Probable Causes (Ranked by Likelihood)

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

Step-by-Step Diagnostic Procedure

Read ambient air temperature PID with a scan tool and compare to actual outside temperature using a thermometer.
Locate the ambient air temperature sensor (usually behind the front bumper or grille area). Inspect the connector for corrosion or damage.
Test sensor resistance with a multimeter: typical range is 10k ohms at 32F (0C) and 2k ohms at 77F (25C). Compare to manufacturer specs.
Check wiring continuity from the sensor connector back to the PCM. Repair any open or shorted circuits.

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.