Outside Air Temperature Sensor Circuit High
The outside air temperature sensor is reading too high of a value.
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What it means (plain English)
The outside air temperature sensor measures the temperature outside your vehicle. If it's too high, the engine control unit (ECU) thinks it's getting hotter air than it actually is, which can affect fuel mapping and emissions. The sensor typically should read between -40°F to +150°F (-40°C to +65°C). Values over this range trigger the code.
What the computer is actually seeing
The ECU detects a voltage signal from the outside air temperature sensor that exceeds the normal operating range, commonly above 4.9 volts for a digital sensor.
What a healthy reading looks like
-40°F to 150°F (-40°C to 65°C) for valid outside air temperature readings.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the outside air temperature sensor wiring for shorts or damage. Repair as needed. Is the wiring intact? If yes, continue to step 2. If no, repair wiring.
- 22. Measure the voltage at the outside air temperature sensor connector with the ignition on. Is the voltage reading over 4.9 volts? If yes, replace the outside air temperature sensor. If no, move to step 3.
- 33. Inspect the sensor connector for corrosion or damage. Is the connector clean and secure? If yes, move to step 4. If no, repair or replace the connector.
- 44. Check the ECU for proper operation. Using a scan tool, does the ECU respond correctly with other sensor inputs? If yes, replace the ECU. If no, the system is functioning correctly.
Common causes
- Faulty outside air temperature sensor
- Wiring issues (short to voltage)
- Corroded connectors
- ECU malfunction
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but consider fixing it soon as it can affect emissions and fuel efficiency.
Will this code come back after clearing?
It may return if the underlying problem isn't fixed.
Why does this code often pair with other SPN codes?
Sensor faults commonly affect multiple systems and can trigger related fault codes.
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