Fault code P0097 – a step-by-step guide to diagnosing and fixing it

Error code P0097 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system detects a low mass air flow in the intake air temperature circuit 2. This DTC P0097 indicates a problem with the intake air temperature sensor or the associated wiring. For some manufacturers, this fault code may also be referred to as "Intake Air Temperature Circuit 2 Low".

What can cause this error code?

• Defective intake air temperature sensor (IAT sensor 2)
• Damaged or corroded wiring to the IAT sensor
• Loose or corroded plug connections
• Short circuit in the sensor circuit to ground
• Defective engine control unit (ECU)
• Dirty or clogged air filter
• Leaks in the intake system
• Faulty ground connection of the sensor

Which symptoms occur in parallel with fault code P0097?

• Engine performance: Reduced engine performance and poor acceleration
• Fuel consumption: Increased fuel consumption due to incorrect mixture formation
• Idle problems: Uneven idling or idling fluctuations
• Starting behavior: Difficult cold starts, especially at low temperatures
• Exhaust values: Increased emission values and possible problems with the emissions test
• Warning lights: Check engine light illuminates permanently

How can the problem with error code P0097 be rectified?

• Repairing trouble code P0097 requires a systematic diagnosis of the intake air temperature circuit.
• Replacement of the defective intake air temperature sensor with a new original part or high-quality spare part
• Repair or replacement of the damaged wiring between the sensor and engine control unit, including insulation and protection against further damage
• Cleaning and treatment of corroded plug connections with contact spray and subsequent sealing against moisture
• Elimination of short circuits in the sensor circuit by localizing the damaged area and professional repair
• Replacing the engine control unit in the event of a proven malfunction after prior programming and coding
• Cleaning or replacing the air filter to ensure optimum air supply
• Sealing of leaks in the intake system by replacing defective seals or hoses