Giulietta's Sluggish Performance Linked to Exhaust Sensor

Had the same problem with my 2016 Alfa Romeo Giulia 2.0 Diesel. The symptoms matched exactly, poor performance, increased fuel consumption, and check engine light. The exhaust temperature sensor was indeed faulty, causing incorrect readings in the emission control system. The temperature fluctuation from the damaged sensor made the engine computer run a richer fuel mixture as a safety measure. This explains both the higher fuel consumption and sluggish performance. My mechanic found two issues during diagnostics: a failing heat sensor and a small leak in the exhaust system near the sensor mounting point. The sensor replacement alone might not solve your problem completely. In my case, the exhaust leak was making the sensor read incorrect values. This is quite common on these engines after 70000km. The complete fix required both sensor replacement and exhaust repair, but it fully restored performance and fuel economy. Worth getting a proper diagnostic test focused on the exhaust system components. These symptoms strongly indicate a sensor-related issue rather than a mechanical engine problem. Its best to address it soon as continued operation could affect other emission control components.

Thanks for sharing your experience with the Giulia. That really helps clarify things. My Giulietta had identical symptoms and it turned out the exhaust temperature sensor was indeed the culprit. The temperature fluctuation issues disappeared completely after the fix. Would you mind sharing how much you paid for the complete repair? Also curious if youve had any similar issues since getting it fixed? Still monitoring my fuel consumption closely as these exhaust component problems can sometimes return.

Just had the repair done last month actually. The total came to 265 Euro for fixing both issues, replacing the faulty exhaust temperature sensor and repairing the exhaust system leak. The engine management system now reads correctly and the temperature fluctuation problems are completely gone. No recurring issues since the fix. Fuel consumption returned to normal immediately after the repair. The heat sensor readings are now stable and the check engine light hasnt come back on. Performance is back to what it should be. The mechanic confirmed that letting a faulty temperature sensor go unchecked can lead to more extensive exhaust system damage over time. Getting both issues fixed together was definitely the right call, the leak was making the sensor readings even more unreliable. The repair costs were worth it considering the improved performance and fuel savings. Monitor your fuel consumption but with a properly functioning sensor and no exhaust leaks you should be fine going forward.

After getting this advice I finally went to my trusted mechanic for a complete diagnosis. The examination revealed a faulty exhaust temperature sensor combined with a small crack in the exhaust component housing. The repair cost me 290 Euro total including parts and labor. The temperature sensor replacement fixed the sluggish performance immediately. The emission control system now works perfectly and my fuel consumption dropped back to normal levels. The check engine light hasnt returned since the repair three weeks ago. My mechanic explained that these heat sensor issues are quite common at this mileage. The crack in the exhaust housing was making the sensor readings even more erratic, which explained the severe symptoms. Getting both fixed at once was definitely the right choice. Really glad I asked here before going back to the previous shop. The proper diagnosis saved me from potential further damage to other emission control parts. The car runs like new again and the fuel savings already started offsetting the repair cost.