Fault code P0096 – a step-by-step guide to diagnosing and fixing it

Error code P0096 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected an error in the intake air temperature sensor 2 (IAT2), which is in the "low" range. This DTC P0096 indicates that the sensor is sending a signal below the expected voltage range. With various manufacturers, this error code can also be referred to as "Intake Air Temperature Sensor 2 Circuit Low".

What can cause this error code?

• Defective intake air temperature sensor 2 (IAT2)
• Damaged or corroded sensor cable
• Loose or corroded plug connections
• Short circuit to ground in the sensor circuit
• Defective engine control unit (ECU)
• Interruption in the power supply to the sensor
• Mechanical damage to the sensor housing
• Dirty or clogged sensor element

What symptoms occur in parallel with fault code P0096?

• Starting problems: The vehicle shows difficulties with a cold start or requires several attempts to start.
• Uneven idling: The engine runs unevenly or fluctuates in speed at idle.
• Poor fuel efficiency: Increased fuel consumption due to incorrect mixture calculation.
• Loss of power: Reduced engine performance, especially in cold temperatures.
• Jerking when accelerating: Uneven engine performance during acceleration.
• Black smoke: Dark exhaust fumes due to the fuel-air mixture being too rich.

How can the problem of error code P0096 be rectified?

• Fixing this trouble code requires a systematic diagnosis of the intake air temperature sensor and its wiring.
• Sensor check and replacement: measure the voltage at the IAT2 sensor with a multimeter and replace the defective sensor with an original part if the values are out of specification.
• Repair wiring: Check all cables between the sensor and ECU for damage, corrosion or breaks and completely repair or replace any damaged wiring.
• Clean plug connections: Disconnect the connector at the sensor, clean the contacts with contact spray and make sure the connection is tight and free of corrosion.
• Check the earth connection: Check the ground connection of the sensor circuit and clean or repair poor ground connections on the engine or chassis.
• ECU diagnosis: Have the engine control unit checked by a specialist and, if necessary, reprogram or replace it if other repairs do not rectify the fault.
• Replace the entire sensor unit: Replace the entire intake air temperature sensor assembly, including wiring, if problems recur.