A3 — Exhaust gas NTC on the flow control has open circuit or short circuit

What does A3 mean?

The exhaust gas NTC sensor, specifically the one located on the flow control, has an open circuit (no signal) or a short circuit (incorrect signal). This affects exhaust gas monitoring and safety.

• The exhaust gas NTC sensor at the flow control is faulty or has failed.
• The connection cable to this sensor is damaged or disconnected.
• Loose or corroded connections at the sensor or circuit board.

Click steps to track your progress.

1. 1

   Check the exhaust gas NTC sensor at the flow control and its connection cable for any damage or loose connections.

2. 2

   Ensure all cable connections are secure and properly seated.

3. 3

   If damage or fault is identified, replace the sensor and/or its connection cable, or contact a qualified technician if the circuit board is suspected.