Audi Q3 Throttle Valve Causing Rough Idle and High MPG

Last month I had similar symptoms with my 2011 Audi A4 2.0 TFSI. The car throttle response was inconsistent and fuel efficiency dropped significantly. Initial diagnostics pointed to the throttle position sensor and air intake system. The main issue was carbon buildup affecting throttle response. Throttle cleaning alone did not resolve it. The throttle body had to be removed and professionally cleaned, plus the throttle position sensor needed replacement due to internal wear. This is a known issue requiring proper diagnosis. The symptoms you describe, rough idle, high fuel consumption, and cold start problems, match exactly what I experienced. The throttle position sensor degradation is a serious problem that can lead to complete engine management system malfunction if left unaddressed. Key areas that needed attention: Full throttle body cleaning, Air intake system inspection, Throttle position sensor replacement, Electronic throttle control module testing This repair requires specialized diagnostic equipment. The job itself is complex since the throttle body is integrated with various engine management systems. Would recommend getting it checked soon as these symptoms typically worsen quickly.

Thanks for sharing your experience. My Audi Q3 got fixed last week and your description matches exactly what I went through. The rough idle and starting issues were really concerning. Did you remember the total repair cost? My mechanic recommended a complete throttle body replacement instead of just cleaning since the air intake system was also affected. Just wondering if you had any other issues pop up after the repair was done? My fuel efficiency seems better now but still monitoring it closely.

Had exactly the same repair done. The throttle valve replacement fixed all those issues completely. Total cost was 205 Euro to replace the defective accelerator pedal module, which was causing the inconsistent engine throttle response. Since the repair three months ago, fuel consumption returned to normal and the control valve system works perfectly. No more rough idle or cold start problems. The engine throttle response is smooth again, just like when the car was new. The mechanic made the right call suggesting a complete replacement rather than just throttle cleaning. While cleaning can sometimes work, when multiple components are affected, replacement is the more reliable solution. My car runs great now with no issues whatsoever. The investment was worth it considering how critical the throttle system is for proper engine function. Keep monitoring your fuel consumption, you should see it stabilize within the next few tank fills.

Thanks for the input. Finally got it sorted last week after finding a better mechanic. The throttle valve indeed needed replacement along with a thorough throttle cleaning of the intake system. Cost me 890 Euro in total. The symptoms matched perfectly, rough engine idle and poor fuel efficiency were the main issues. The mechanic showed me the old throttle body which was completely gunked up. After replacement, the difference was immediate. Engine starts smoothly now, even in cold weather. The new throttle position sensor works great and fuel consumption dropped back to normal levels. Really glad I got it fixed before it caused more serious problems. The engine runs like new now, totally worth the investment. For anyone else facing similar issues, get it checked early. These problems only get worse and more expensive to fix if left unattended.