Inlet Air Temperature Sensor Fault
Indicates a problem with the inlet air temperature sensor reading.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The inlet air temperature sensor checks how hot the air coming into the engine is. If it's too hot or too cold, the engine computer gets confused and may not mix fuel and air correctly.
What the computer is actually seeing
The engine control unit (ECU) monitors the inlet air temperature sensor voltage, which should typically range from 0.5V (around -40°C) to 4.5V (around +125°C). If the voltage is outside this range, a fault code is set.
What a healthy reading looks like
Expected voltage from inlet air temperature sensor should be between 0.5V and 4.5V corresponding to temperatures from -40°C to +125°C.
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. Inspect the inlet air temperature sensor wiring and connectors for damage or corrosion. Decision: Are they okay? Yes: Go to step 2. No: Repair or replace the wiring/connectors.
Common causes
- Faulty inlet air temperature sensor
- Wiring issues or bad connectors to the sensor
- Intake air leaks affecting temperature readings
- ECU calibration issues
Typical repair cost
$$ (200 - 800 dollars)
Related codes
Frequently asked questions
Is it safe to drive with this fault?
It's generally safe, but drivability issues may arise due to poor engine performance.
Will the code come back after clearing?
If the underlying issue isn't resolved, the code is likely to return.
Why is this paired with SPN 4565?
Both codes relate to temperature readings in the air intake, indicating a common issue.
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