What are the causes of IVECO China VI emission faults?
3 Answers
IVECO China VI emission faults are most commonly caused by the oxygen sensor in the exhaust pipe. Below are the related explanations: Carbon buildup on components: The most common cause is when carbon deposits or other impurities from the engine or gasoline are carried out with the exhaust gases, contaminating and covering the oxygen sensor, preventing it from properly collecting signals, which triggers the emission fault warning light. This issue is somewhat related to the quality of the fuel used. After removing the carbon deposits and restarting the engine, the warning light should turn off. Other factors: Another major cause is the oxygen sensor itself being damaged and unable to function properly. In this case, the oxygen sensor needs to be replaced. Additionally, if there are issues with the wiring harness between the oxygen sensor and the computer, causing the computer to continuously or intermittently fail to receive signals from the oxygen sensor, the emission fault warning light will illuminate. In such cases, the related wiring harness needs to be addressed.
My Iveco delivery van has run over 40,000 kilometers, and recently the emission fault light keeps coming on. Inspection revealed the DPF (Diesel Particulate Filter) is completely clogged, with black smoke coming from the exhaust pipe. The repair shop said the China VI emission standards are stringent, and for someone like me who mainly drives short urban trips without highway runs, the particulate matter doesn’t burn cleanly and accumulates as soot. Using low-quality diesel makes it worse, and the urea system might also have clogged nozzles or leaks. They also removed the sensor and found the NOx probe was faulty, triggering an error. I recommend regular maintenance and occasional highway cruising to allow system regeneration, preventing minor issues from turning into major repairs. Always pay attention to fuel quality and avoid cheap options, or the repair costs could end up being as much as buying a new car. (Approx. 160 words)
I've been repairing IVECO China VI vehicles for many years and have seen many emission issues. The typical culprit is the aftertreatment system causing trouble, such as the SCR urea pump failing to inject liquid, leaving nitrogen oxides untreated; DPF regeneration failure leading to carbon buildup clogging the pipes; or faulty NOx or O2 sensors sending false signals to the ECU. Contaminated fuel or poor-quality urea are often the root causes, polluting the system. I recommend owners use standard diesel without water contamination and regularly take long highway drives to allow the DPF to burn off soot. If the warning light comes on, get it diagnosed at a workshop immediately—professional equipment can pinpoint the issue accurately. Avoid disassembling parts yourself, as this may cause more serious engine damage. (Approx. 150 words)
