P00EA
Intake Air Temperature Sensor 3 Circuit Low Bank 1.
- Generic
- Powertrain
- Generic code
- Low severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 0
- AreaFuel and air metering, auxiliary emission controls
- EA
- FaultThe specific fault in that area
What it means
P00EA means the engine control unit has detected that the signal from intake air temperature sensor 3 on bank 1 is lower than the expected range. A low signal voltage normally points to a short to earth or a sensor fault, because the unit reads it as an extremely high air temperature. The exact location of sensor 3 depends on the engine, for example after a charge air cooler or in the intake manifold.
Symptoms
- Engine warning light on
- Poor performance or reduced power as the unit uses a default temperature value
- Hesitation or rough running under load
- Hard starting or uneven idle in some cases
- Increased fuel consumption
Possible causes
- Faulty intake air temperature sensor 3 with an internal shortlikely
- Signal wire chafed and shorted to earthlikely
- Damaged, corroded or water-contaminated connector at the sensorpossible
- Signal wire shorted to another earth or sensor earth wire in the harnesspossible
- Wrong or incorrectly fitted sensor after previous repairsrare
- Fault inside the engine control unitrare
How to diagnose
- Read all stored and pending codes and note any other intake or charge air temperature codes, then review freeze frame data.
- Identify which sensor is number 3 on bank 1 for this engine using the manufacturer wiring information, as its location varies by model.
- Inspect the sensor, connector and nearby wiring for chafing, heat damage, moisture, corrosion and bent or pushed-back pins.
- With the ignition on and the sensor connected, view the live temperature reading and compare it with the other intake air temperature readings and ambient temperature on a cold engine.
- Unplug the sensor and see if the reading goes to the open circuit value; if it does, the sensor or wiring after the plug is suspect, and if it stays low, suspect a wiring short.
- Measure the sensor resistance and compare it with the specification for the temperature at the time.
- Check the signal wire for a short to earth with the control unit and sensor disconnected, following the wiring diagram.
- Check the reference voltage and earth at the connector to confirm the control unit side is working.
How to fix
- Replace intake air temperature sensor 3 if its resistance is out of specification.
- Repair or replace the damaged wiring where the signal wire is shorted to earth.
- Clean or replace the corroded or damaged connector and terminals, and seal against moisture.
- Correct any incorrectly routed harness that is rubbing on hot or sharp parts and secure it properly.
- Repair or replace the control unit only after wiring and sensor faults have been fully ruled out, then clear the code and road test.
Can I keep driving?
Low severity
The car can usually be driven for a short time, but it may run poorly because the unit uses a substitute temperature value. Book it in soon so that the fault does not hide other problems.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.