Audi Q5 Power Loss Points to Faulty Exhaust Sensor

Interesting timing, I had a similar issue with my 2006 Audi Q7 2.0T last year. I have some experience working on cars, mainly basic maintenance, but exhaust system issues were new territory for me. The symptoms matched yours exactly, reduced power, higher fuel consumption, and that annoying check engine light. After checking online forums, I took it to a certified workshop where their engine management diagnostics revealed a leak in the exhaust system near the temperature sensor housing. The heat sensor itself was actually fine, but the leak was causing incorrect readings. The complete repair included replacing a section of the exhaust component and resealing the sensor housing area. Total cost was 265 Euro, which included diagnostic work and labor. The improvement in performance was immediate. Before suggesting specific fixes for your case, could you share: Any unusual sounds from the exhaust area? Does the engine sound different at idle? Have you noticed any dark spots under the car that might indicate leaks? When did these symptoms first appear? This information would help determine if your issue matches what I experienced. With Q-series models from that era, exhaust system problems are relatively common, but its best to get an accurate diagnosis.

Last service was at 43102 KM. Since replacing the exhaust temperature sensor, the engine performance has improved significantly. The check engine light turned off after about 50 KM of driving. The workshop found that the old sensor was giving incorrect readings to the emission control system. For others facing similar problems, the diagnostic report showed error code P0113, and the repair cost was 180 Euro including parts and labor. Simple temperature sensor replacement fixed both the power loss and fuel consumption issues. The car runs smoothly now without any warning lights. I recommend getting the sensor checked if experiencing similar symptoms, as it turned out to be a straightforward fix rather than a major exhaust component problem.

I am glad to hear you got it sorted out with a sensor replacement. My case turned out differently with the exhaust system leak, but these temperature fluctuation issues can have multiple causes in our Audi Q models. The price you paid at 180 Euro is quite reasonable, definitely better than my 265 Euro repair bill for the exhaust component work. These emission control related fixes can sometimes cost much more, so we both got lucky with relatively straightforward solutions. Good point about the error code P0113. When my exhaust sensor area was repaired, I also learned how critical accurate temperature readings are for proper engine performance. The fact that your fuel consumption returned to normal confirms the diagnosis was spot on. Just keep monitoring for any changes during the next few thousand kilometers. In my experience with these models, a new sensor typically lasts 60000-80000 KM before showing signs of wear, but proper maintenance of the surrounding exhaust system components helps extend its lifespan.

Thanks for the detailed follow-up about the sensor repair. After driving another 500 KM since the temperature sensor replacement, I can confirm the fix was successful. My fuel consumption is back to normal at about 8.5L/100KM, and the engine management system shows no new error codes. The emission control system seems to be working perfectly now that it gets accurate readings from the new sensor. For the record, watching the engine diagnostic data through my OBD scanner shows stable temperature readings without the previous fluctuations. If anyone encounters similar symptoms, reduced power, high fuel usage, and engine light with code P0113, getting the exhaust temperature sensor checked should be your first step. At 180 Euro, the repair was much more affordable than I initially feared when suspecting major exhaust component issues. The workshop mentioned these sensors typically need replacement around 60000-80000 KM, so I will keep an eye on it during future services. But for now, very happy with how the car performs after this straightforward fix.