Audi Q3's Multiple Engine Issues Point to Bad Injectors

As someone with decent repair experience, I dealt with nearly identical issues on my 2017 Audi Q5 last year. The symptoms matched yours exactly, poor performance, rough idle, and increased fuel consumption. The root cause was indeed clogged injection valves affecting proper fuel delivery and emissions. After multiple performance issues, I took it to a specialized workshop where they diagnosed dirty injectors through proper testing. The cleaning and replacement procedure took about 4 hours, costing 515 Euro total including parts and labor. The fix made a massive difference, the vehicle runs smoothly now with normal fuel consumption and no more stalling issues. However, to provide more specific advice for your situation, could you share: Current mileage on your Q3, Type of fuel you typically use, When the symptoms first appeared, Any warning lights on the dashboard, Previous maintenance history This information would help determine if your issues stem from similar clogging problems or if there might be other factors involved. Consider getting a diagnostic scan done first, it could reveal if the injectors are actually the root cause before committing to repairs.

Latest service was completed at 46000 KM, currently at 47629 KM. Thanks for sharing your repair experience. Since posting, I took the car for diagnostics and error codes point to cylinder 2 misfire. The mechanic confirmed injector issues but also noticed carbon buildup affecting engine performance. They recommended a full fuel system cleaning plus injector replacement, quoted at 680 Euro for parts and labor. Wondering if this sounds reasonable or if I should explore other repair options before proceeding. The issues started about 3 weeks ago and have gradually gotten worse, especially during cold starts. Regular 95 octane fuel has always been used. Based on your similar experience, did you notice any warning signs before the complete repair became necessary?

Having gone through this with my Q5, I can confirm the quote of 680 Euro for both injector replacement and fuel system cleaning is quite reasonable. The carbon buildup you mentioned is actually a common issue in these diesel engines, often occurring alongside injector problems. When my issues started, I initially noticed minor hesitation during cold starts before it developed into the more serious problems. The gradual decline in performance matches your experience exactly. Looking back, I should have addressed the early warning signs sooner, as waiting likely contributed to the carbon deposits. For reference, after my repair was completed, the workshop recommended: Using higher grade fuel occasionally to help prevent future buildup, Replacing fuel filters according to maintenance schedule, Not letting the fuel tank run too low to prevent debris accumulation The complete repair resolved all performance issues and restored proper emissions levels. Given your mileage and symptoms, I would proceed with their recommended repair plan rather than risk further engine damage or increased fuel consumption from delayed maintenance. The combined cleaning and injector replacement should provide a more thorough fix than just addressing one component, especially considering the confirmed carbon buildup.

Thanks for the detailed feedback. After considering your experience and advice, I've decided to go ahead with the full repair package. The 680 Euro price seems fair, especially since it addresses both the injector replacement and carbon buildup issues that are causing the engine performance problems and misfires. I'll make sure to follow those preventive maintenance tips too, switching to premium fuel occasionally and staying on top of filter changes makes sense to avoid future clogging. Better to fix everything properly now than risk more expensive repairs down the road. Will schedule the work for next week since the cold start issues are getting worse. The consistent symptoms between our cases gives me confidence this is the right approach. Really appreciate you sharing your repair experience, it helped confirm my mechanic's diagnosis and recommended fix. I'll update the forum once the work is complete to let others know how it turned out.