Audi A1 Engine Light + Stalling: Fuel Vent Fix Guide

Having experienced similar symptoms with my 2016 Audi A3, I can confirm this is likely related to the emission system. The check engine light appeared repeatedly, and the stalling during idle matched your description exactly. The root cause was clogged vapor recovery hoses in the tank ventilation system. The pressure sensor was reporting incorrect readings because the system could not maintain proper pressure. When the hoses get clogged with debris or carbon buildup, the engine management system struggles to regulate fuel delivery properly. The repair required: Complete cleaning of the ventilation hoses, Replacement of the pressure sensor, Inspection of the purge valve, System pressure test This was a serious issue that needed immediate attention, as continued operation could damage the fuel system components. The vapor recovery system is crucial for proper engine operation and emissions control. First steps to check: 1. Ensure gas cap is properly sealed 2. Listen for unusual hissing near the fuel tank 3. Check for visible damage to accessible hoses 4. Have the pressure sensor tested with diagnostic equipment If these basic checks dont reveal the issue, professional diagnosis will be necessary as the tank ventilation system is complex and interconnected with multiple components.

Thanks for sharing your experience with the EVAP system issues. Sounds very similar to what I was dealing with on my Audi A1. I got it fixed a few months ago by having the entire fuel tank ventilation system cleaned and the pressure sensor replaced. Just wondering, do you remember roughly how much the automotive repair cost in your case? Also, has everything been working properly since the fix, or have you noticed any other engine light issues coming up? I want to compare costs before taking mine to the shop since my last mechanic seemed unsure about the proper diagnosis.

Thanks for asking about the repair costs. After seeing my mechanic, the tank ventilation valve issue was completely resolved. The total bill came to 175 Euro for cleaning the clogged hoses, which was actually more reasonable than I expected. Since the repair, the check engine light has stayed off and the car runs smoothly even at idle. The pressure sensor now shows correct readings and the entire EVAP system works as intended. It has been 8 months with no recurrence of the original symptoms. A properly functioning tank ventilation system is crucial for fuel efficiency and emissions control. If your symptoms match what I experienced, getting those hoses cleaned could solve the problem. Just make sure the shop does a thorough pressure test afterward to confirm everything is sealed correctly. My advice would be to have it fixed soon, as continuing to drive with clogged ventilation hoses can lead to more expensive fuel system repairs down the line.

After getting multiple quotes, I finally took my Audi to a specialized repair shop. The mechanic immediately identified the clogged ventilation system as the source of my check engine light and stalling issues. The total repair cost was 220 Euro, which included cleaning the entire tank ventilation system, replacing the pressure sensor, and running complete diagnostics. The repair process took about 4 hours, and they showed me the carbon buildup they cleaned from the hoses. Since the fix three weeks ago, my car runs perfectly with no stalling at idle. The engine light has stayed off, and fuel efficiency has actually improved slightly. For anyone else facing similar issues, getting a second opinion from a specialist was worth it. The first mechanic missed the diagnosis completely, but the actual fix was straightforward once properly identified. Make sure to check your gas cap seal regularly to prevent future ventilation system problems.