What are the reasons for the new engine's exhaust emissions failing to meet standards?

[SanLiam]

The reasons for the new engine's exhaust emissions failing to meet standards can be attributed to two main aspects: fuel quality and automotive circuit faults. Regarding fuel quality issues: Fuel quality issues mainly manifest as improper air-fuel mixture ratio, incorrect ignition timing, and poor fuel quality. Regarding circuit faults: Circuit faults mainly manifest as faults in the circuit system, with high carbon and oxygen content. The solution is to recommend checking that the resistance of high-voltage wires is not too high, inspecting the spark plugs for excessive gap, and then removing the fuel injectors to check the atomization state and sealing condition. It is also necessary to check whether the three-way catalytic converter and oxygen sensor are malfunctioning, causing all emission values to fail to meet standards.

[TeaganFitz]

As an experienced auto mechanic, I've found that new engines failing emissions tests often relate to initial installation and calibration issues. Even though the machine is new, improper calibration of the oxygen sensor during installation can easily cause air-fuel mixture imbalance, leading to incomplete combustion. Or if the catalytic converter is misaligned, causing poor exhaust flow, emissions will exceed standards. New cars might also have issues from using low-quality gasoline, clogged fuel injectors, or incorrect spark plug gaps. I recommend immediately visiting a professional shop for diagnosis - don't delay, as this could affect engine longevity or even result in fines. Checking ECU data and exhaust system pressure can quickly resolve most problems. During the break-in period, drive gently using high-octane fuel, avoid sudden acceleration or prolonged idling - this not only benefits the environment but also prolongs your vehicle's health.

[MacAnthony]

As an environmentally conscious individual, I'm concerned about new engines failing emission tests, primarily due to pollution caused by incomplete combustion or impure fuel. Low-quality gasoline with high sulfur content produces large amounts of harmful gases after combustion; or ignition system failures such as aging spark plugs can lead to excessive emissions. The China VI standards are stringent, where even minor oversights can cause failure. I always advocate for using clean fuel, regular maintenance, and avoiding short urban trips to reduce carbon buildup. A malfunctioning exhaust system, such as a failed catalytic converter, amplifies pollution and affects air quality. Timely repairs not only help pass tests but also protect the environment. New vehicles especially require attention to initial tuning, using genuine parts, and developing good driving habits—ultimately saving time and money in the long run.

[LolaLynn]

As a tech enthusiast, I've dealt with new car emission issues, often stemming from electronic components. The ECU settings are messed up, oxygen sensors give wrong readings, and fuel injection is inaccurate; or the exhaust pressure sensor fails, causing leaks that lead to exceeding standards. Clogged fuel injectors or faulty ignition coils are also common. Check the wiring harness connections yourself, use an OBD diagnostic tool to read fault codes, and you can quickly pinpoint the problem. Don't overlook small details in new cars, address them promptly to prevent worsening.