VW Tiguan CEL: Intake System Warning Signs

Had a similar situation with a 2017 VW Golf TDI. The check engine light came on due to a vacuum leak between the brake booster pump and the intake manifold. The air supply system was compromised, causing unstable idle problems and occasional engine stalling. The root cause was a deteriorated rubber hose connection. These vacuum leaks often trigger manifold pressure sensor warnings because the system cant maintain proper pressure. While initially tempting to keep driving, this issue requires immediate attention since it affects both engine performance and brake assist functionality. The repair involved replacing the degraded hose and checking all connecting points in the vacuum system. It turned out to be a fairly common issue with diesel engines in this age range. The symptoms started mild but could have led to more serious complications if left unaddressed. A qualified technician should perform a proper diagnostic scan, as similar symptoms can stem from various vacuum-related issues. Until repaired, there is risk of sudden engine stalling, especially during idle or low-speed driving conditions.

Thanks for sharing your experience with the Golf TDI vacuum issue. My Tiguan had nearly identical symptoms and I also noticed the throttle body response became sluggish before I got it fixed. Did you remember the repair cost for your hose replacement? After my repair was done, I kept monitoring the check engine status for a few weeks but everything stayed normal. Just wondering if you had any recurring issues or if the fix solved it completely for you?

The repair completely resolved the vacuum leak and related throttle body issues. The total cost was 175€ for replacing the faulty hose connection between the pump and air valve. Since having the work done, the manifold pressure has remained stable and the idle problems disappeared completely. After the repair, I monitored things closely for about 2 months, but the engine ran smoothly with no check engine lights or air supply concerns. The improved throttle response was immediately noticeable. Like you, I was relieved to have the issue properly diagnosed and fixed. These vacuum system repairs are pretty straightforward when handled by a competent mechanic who knows where to look. The key is catching the problem early before it can cause additional wear on related components.

Just got back from having my Tiguan inspected and fixed at a new mechanic shop. They diagnosed it as a vacuum leak affecting the intake manifold, similar to what you experienced. The repair cost was 195€, slightly more than yours but included a full system inspection. The mechanic showed me the worn vacuum hose that was causing the air supply issues. The throttle response improved instantly after the repair. No more check engine lights or engine stalling concerns. Really glad I addressed this early instead of continuing to drive with the warning light on. The new shop also did a great job explaining the whole issue and showing me the replaced parts. Been driving for two weeks now with no problems. The idle is smooth and the engine performance is back to normal. This experience definitely taught me not to ignore these warning signs, even if the car seems to run okay at first.