VW Arteon CEL: Idle Issues Point to Air Valve Trouble

Had similar symptoms with a 2020 VW Passat. The check engine light and idle problems turned out to be caused by vacuum hoses that had deteriorated over time. The manifold pressure readings were inconsistent due to a significant vacuum leak between the brake booster pump and check valve. The air intake system inspection revealed multiple connection points where the rubber hoses had become brittle and cracked. This is actually a common issue that can cause serious engine performance problems if left unaddressed. The stalling happens because the engine management system cant maintain proper air-fuel ratios when vacuum leaks affect sensor readings. The repair involved replacing several vacuum hoses and pressure testing the entire system to ensure proper sealing. Important to note that using OEM parts is crucial here, as aftermarket hoses often dont match the original specifications precisely. This isnt a minor issue, vacuum leaks can lead to increased fuel consumption and potential damage to other components if not fixed promptly. Would strongly recommend getting it diagnosed at a certified shop that can properly pressure test the entire vacuum system.

Thanks for sharing that experience with the vacuum leak repair. My throttle body actually ended up needing replacement along with the vacuum hoses. The air supply issues completely resolved after fixing both. Really curious how much you ended up paying for your repair? Also wondering if you've had any other air system problems pop up since getting it fixed? My repair was about 6 months ago and everything seems stable now, but always good to know what to watch out for with these engine management issues.

Since having the air valve and hose connection issues fixed by my mechanic, the system has worked flawlessly. The total repair came to 175€, which covered replacing the deteriorated vacuum hoses between the pump and valve. The manifold pressure readings have remained stable, and I haven't experienced any additional air intake problems in the past year. One thing to note about the air supply system in these VW models, once the faulty components are properly replaced, they tend to remain reliable. The key was using quality parts and ensuring all vacuum hoses were properly pressure tested after installation. The original issues with inconsistent idle and engine performance completely disappeared after the repair. Would definitely track any changes in engine performance though, as vacuum leaks can develop over time. But proper repairs with quality parts should prevent similar issues from recurring.

I really appreciate that detailed feedback. After dealing with the uncertainty, I finally took my car to a certified VW specialist. The check engine warnings and stalling issues were definitely nerve-wracking, but the repair process went smoothly. They found both the throttle body damage and vacuum hose deterioration during their diagnostic tests. The total came to 680€ for parts and labor, which was actually less than expected given the thorough work needed. The manifold pressure is now perfectly stable and those frustrating engine stalling episodes are completely gone. Really glad I didnt try to save money with another questionable repair shop, the specialist knew exactly what to check and how to fix it properly. Six months later and the engine runs like new. No check engine lights, steady idle, and the air valve system works perfectly. It was worth investing in proper diagnosis and repair rather than risking further damage with temporary fixes.