VW Touran Diesel NOx Sensor & Exhaust Leak Alert

Having faced similar issues with my 2012 VW Tiguan diesel engine, the NOx emission sensor failure symptoms match your description. The check engine light combined with exhaust concerns typically points to problems with the nitrogen oxide monitoring system. The catalytic converter and its connected sensors form a complex system. When the emission sensor starts failing, it often triggers false readings, causing the engine management system to react incorrectly to exhaust gas composition. In my case, the initial diagnosis revealed loose cable connections at the NOx sensor. However, after a deeper inspection, there was damage to both the wiring harness and the sensor unit itself. The repair required replacing the complete emission sensor assembly and recalibrating the engine management system. This is considered a serious issue because faulty readings from NOx sensors can lead to: Increased fuel consumption, Reduced engine performance, Risk of catalytic converter damage, Failed emission tests, Potential engine damage if left unaddressed Given your vehicle age and mileage, along with the symptoms described, investigating the emission sensor system is a logical first step. A professional diagnosis using specialized diagnostic equipment can confirm if the NOx sensor is truly the root cause before any parts replacement.

Thanks for sharing your experience with the NOx sensor issue. My diesel engine was showing similar symptoms last year. The mechanic also initially suspected a faulty exhaust system but it turned out to be the nitrogen oxide monitoring setup. I would really like to know how much you ended up paying for the complete fix and if any other problems appeared since the repair. Did the fuel consumption improve after fixing the NOx sensor? My catalytic converter also needed a checkup while they were working on the system.

Good news, after getting the repair done, all NOx sensor related issues were completely resolved. The final bill came to 95€ for fixing the faulty cable connection at the emission sensor. The mechanic discovered the plug connection was corroded, affecting the air-fuel ratio readings. Since the repair, the check engine light has stayed off and fuel efficiency has noticeably improved. The proper functioning of the nitrogen oxide monitoring system seems to have optimized the engine performance. The catalytic converter check showed it was working fine, so no additional repairs were needed. The diagnostic equipment confirmed the issue was isolated to the connection problems at the NOx sensor. Having a properly functioning emission sensor makes a real difference in how the engine runs. The repair price was reasonable considering the impact on overall vehicle performance. No additional problems have surfaced in the months following the fix. The engine runs smoother and the exhaust system works as intended. When these sensors malfunction, they can cause various issues, but once properly repaired, the problems typically don't return.

I finally got my VW Touran fixed and wanted to share my experience. After checking various components, the mechanic confirmed it was indeed the NOx sensor causing the check engine light issues. The complete repair including parts and labor cost 480€. The repair took about 4 hours total. They found both the sensor and wiring were damaged, likely due to heat exposure from the exhaust system. The mechanic also performed a full diagnostic check on the catalytic converter while the car was up on the lift. Since the repair: Check engine light has stayed off, Exhaust leak noise is gone, Fuel economy improved by about 15%, Engine runs noticeably smoother The pollution control system is now working properly and the car passed its emissions test last week. One tip from my experience, dont wait too long if you notice similar symptoms, as sensor failure can lead to more expensive repairs if left unchecked. The total cost was higher than expected, but worth it considering the improved performance and prevention of potential catalytic converter damage. No issues have appeared since the fix three months ago.