Intake air temperature sensor 1 circuit high input

A sensor-circuit reading is outside the expected range; it does not prove the sensor failed.

WHAT IT GENERALLY REPORTS

A starting point, not a parts list.

The intake-air-temperature circuit reported a high input to the engine computer. “High input” describes the electrical signal category, not necessarily a high air temperature. The code alone cannot distinguish a sensor, connection, wiring, or control issue.

Common symptoms

The check-engine light may be the only noticeable symptom.
Starting, idle, or fuel behavior may change if the reported temperature affects engine control.
The vehicle may continue to feel normal while the code is stored.

Possible causes

An intake-air-temperature sensor or circuit condition.
A connection or wiring issue, whose location depends on the vehicle design.
A related intake or engine-control issue that requires data from the exact vehicle.

Safe initial checks

Record the exact code and other stored codes; note unusually cold or hot conditions when it appeared.
Observe whether starting or idle behavior has changed.
Avoid unplugging sensors or touching wiring; use vehicle-specific service information for circuit checks.

When to get professional help

A technician can compare reported intake temperature with other vehicle data and test the correct circuit.
Use the maker’s service information to identify the sensor and wiring for the exact year, model, and engine.