What it means
The intake air temperature sensor 3 reading on bank 1 is outside the expected range or does not behave as expected.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Intake air temperature sensor 3 on bank 1 reports air temperature to the control module. P00E9 sets when its signal is outside the expected operating range or does not respond as expected, which can indicate sensor drift or a mounting issue rather than a simple open or short.
Common causes
Most likely first.
- Sensor reading drifted
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- Check-engine light on
- Reduced engine performance or power
- Poor fuel economy
How to diagnose it
- Review freeze-frame and live readings from intake air temperature sensor 3 on bank 1, comparing them with ambient and other relevant temperature readings.
- Inspect sensor 3’s mounting and connector for looseness, contamination, or damage that could affect the measured temperature or signal.
- Check the bank 1 sensor 3 wiring for chafing, poor contact, or damage that could distort the reading.
- Observe the sensor reading as conditions change to see whether it responds plausibly rather than remaining damped or drifting.
- Test the sensor and its circuit against the manufacturer’s specification before deciding whether the sensor itself has drifted.
Common fixes
- Secure sensor 3 on bank 1 if it is loose or incorrectly mounted.
- Repair poor connector contact or damaged wiring that is distorting the signal.
- Replace intake air temperature sensor 3 on bank 1 if its reading is outside specification.
- Clear the code and confirm the sensor reading behaves plausibly after the repair.
Can I keep driving?
If the vehicle runs normally, a short, gentle drive is usually possible, but incorrect bank 1 temperature data can reduce performance or fuel economy. Avoid heavy loads if power is reduced and arrange repair soon.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.