Livinia check engine light air valve

Greetings. The check engine light illuminating in conjunction with a suspected air valve malfunction on your 2019 Nissan Livinia (gasoline variant) warrants a systematic diagnostic approach. The air supply system, particularly the secondary air injection system, is crucial for reducing emissions during cold starts. A defective hose connection between the pump and the air valve is indeed a plausible cause, potentially leading to a vacuum leak affecting the throttle body and overall air intake. Before condemning the air valve itself, I suggest a meticulous inspection of all associated vacuum lines and electrical connectors. Are you experiencing any rough idling or unusual engine noises alongside the illuminated check engine indicator?

Thanks for the detailed reply! No rough idling or noises that I've noticed, just the light. Where exactly should I be looking for these vacuum lines?

Understood. Given the absence of additional symptoms, focusing on the hose connecting the air pump to the air valve is prudent. This hose is typically located near the front of the engine, often routed along the inner fender well. However, without specialized knowledge and equipment, pinpointing the exact source of the leak can be challenging. If you're not comfortable with more invasive diagnostics, I suggest you take your Livinia to a qualified workshop. They possess the necessary tools (smoke machines, pressure testers) to accurately diagnose and rectify air intake and vacuum leaks. Continuing to drive with the check engine light active may lead to further complications or potential damage to other emission control components.

Thanks, I appreciate the advice. I took it to a shop, and it was indeed a defective hose connection. Repair cost me 175€ and the light is now off.