How to Deal with Iveco National VI Emission Faults?

[LucilleMarie]

Iveco National VI emission faults are most commonly caused by the oxygen sensor in the exhaust pipe. Below are the relevant details: 1. Carbon buildup on components: The most common reason is that carbon deposits in the engine or impurities in gasoline contaminate or block the oxygen sensor when expelled with the exhaust gas, preventing it from collecting signals properly and triggering the emission fault light. This issue is somewhat related to fuel quality. After cleaning the carbon deposits and restarting the engine, the fault light will turn off. 2. Other factors: Another major cause is damage to the oxygen sensor itself, rendering it unable to function properly. In this case, the oxygen sensor needs to be replaced. If there is an issue with the wiring harness between the oxygen sensor and the computer, causing the computer to intermittently or continuously fail to receive signals from the oxygen sensor, the emission fault light will illuminate, and the wiring harness must be addressed.