Arteon Engine Sensor Fault Causes Rough Running

Had similar issues with my VW Passat 2.0 TSI from a slightly older production year. The car diagnostics showed water sensor malfunction causing rough idle and triggering check engine warnings. The auto electronics inspection revealed corroded connector pins at the coolant temperature sensor. The repair involved cleaning the sensor contacts and replacing the wiring harness connector. This was not just a simple plug connection issue, moisture had damaged the entire sensor assembly. The coolant temperature readings were fluctuating, causing the engine management system to run rich. A proper car diagnostics scan confirmed multiple electrical fault codes related to the cooling system sensors. After replacement, the engine ran smooth again and all codes cleared. This is actually a known weak point in these engines and requires thorough testing of all related sensor circuits. The fix proved reliable, no issues in 40k km since repair. Would recommend having a complete sensor fault analysis done rather than just replacing parts. The electrical connections and wiring should be carefully inspected as corrosion can spread through the harness.

Thanks for sharing your Passat experience. That sensor testing approach sounds very similar to my situation. The moisture sensor issues in my Arteon got resolved about 8 months ago, and the fix has held up well so far. Just curious, do you remember roughly what the total repair cost was for your car? And have you noticed any other auto electronics issues popping up since then? My mechanic mentioned these electrical fault problems can sometimes cascade to other sensors over time.

The moisture sensor repair on my Passat was actually quite affordable, just 95€ for fixing the faulty cable connection. The car diagnostics confirmed it was mainly a connector issue, not a complete sensor failure. Since that repair, the electrical fault codes have stayed clear and the engine runs perfectly. I have not experienced any cascading sensor issues or related auto electronics problems. Regular inspection shows all other sensors are working normally. The key was catching the moisture sensor malfunction early before it could affect other components in the system. The thorough sensor testing performed during diagnosis likely prevented more extensive damage. Unlike some cases where multiple sensors need replacement, fixing just the connection proved sufficient for a lasting solution.

Really appreciate the detailed feedback. Finally got my Arteon fixed last week after getting a second opinion. Total cost came to 120€, which included a complete sensor testing sequence and connector replacement. The mechanic found similar moisture-related issues as you described. The car diagnostics revealed it was mainly the wiring harness causing the electrical fault, not the sensor itself. Much cheaper than the 400€ sensor replacement initially suggested. The engine now runs perfectly smooth and the check engine light has stayed off. The auto electronics inspection was worth every cent, caught a developing corrosion issue that could have spread to other sensor circuits. Will definitely keep monitoring for any similar issues, but feeling confident about the repair quality.