Fault code P0098 – a step-by-step guide to diagnosing and fixing it

Error code P0098 is displayed and the check engine light is on - what does this mean?

The DTC P0098 is recognized by the OBD/EOBD system when a problem is detected with the intake air temperature sensor 2 (IAT2) - specifically a voltage value in the circuit that is too high. This error code affects the engine management system and may have slightly different names for different manufacturers. The sensor monitors the temperature of the intake air after the intercooler or turbocharger.

What causes can this error code have?

• Defective intake air temperature sensor 2 (IAT2)
• Damaged or corroded cable connections to the sensor
• Short circuit in the sensor wiring
• Loose or dirty plug connections
• Defective engine control unit (ECU)
• Interruption in the ground cable of the sensor
• Mechanical damage to the sensor housing

Which symptoms occur in parallel with error code P0098?

• Engine performance: Reduced performance and poor acceleration
• Fuel consumption: Increased consumption due to incorrect mixture formation
• Starting behavior: Difficult starting, especially when the engine is cold
• Idle problems: Unsteady or unstable idling
• Exhaust behavior: Black smoke or increased emission values
• Check engine light: Permanent activation of the warning light

How can the problem with error code P0098 be rectified?

• The repair requires a systematic diagnosis to identify the exact cause.
• Replacement of the defective intake air temperature sensor 2 with an original part or equivalent replacement
• Repair or replace damaged cable connections between sensor and control unit
• Clean and secure all plug connections on the sensor system with contact spray
• Checking and repairing short circuits in the entire sensor wiring
• Replacement of the engine control unit in the event of proven internal defects
• Repairing the earth connection and checking all earthing points in the engine system