VW Atlas Water Sensor Failure Causing Engine Issues

Had similar sensor fault symptoms on a 2019 VW Tiguan. The rough running and malfunction indicator turned out to be corroded wiring connections at the coolant temperature sensor. The repair involved cleaning the connector pins and replacing the wiring harness section that connects to the sensor. This was actually a known electrical fault where moisture intrusion caused connection issues over time. The sensor itself was functioning properly, it was just the signal transmission that was compromised. This type of repair generally requires removing some engine covers and carefully tracing the wiring path. The technician needs to verify the sensor readings before and after repair to ensure the electrical connection is fully restored. While not a major mechanical issue, proper diagnosis is important since similar symptoms can point to other problems. Most sensor issues like this stem from connection problems rather than sensor failure. Getting a proper diagnostic scan and pin-point testing of the circuit is essential before replacing parts. A qualified shop should be able to determine if cleaning and repairing connections will resolve the car sensor problem rather than defaulting to full replacement.

Thanks for sharing your Tiguan experience. Getting my Atlas serviced next week for that sensor issue. Wondering if you recall the final repair cost for the wiring harness and labor? The auto electronics diagnosis is covered under warranty but Im concerned about additional expenses if more problems show up during testing. Has the fix held up well since then or did you notice any other sensor related problems?

Just had the Atlas back from the shop last week after experiencing those same auto electronics issues. The water sensor malfunction was exactly what they found, a faulty cable connection causing bad readings. Total cost came to 95€ for the repair, which included cleaning and fixing the connector. The moisture sensor troubleshooting revealed it was definitely just the wiring connection, not the component itself needing replacement. The malfunction indicator hasnt come back on since the fix, and the engine is running smoothly again. No other sensor related problems have surfaced. Much cheaper than a full sensor replacement, and the technician confirmed this is a fairly common issue they see with these particular water sensor setups. Having a proper diagnostic scan done first definitely saved some money instead of just swapping parts.

After taking the Atlas to my regular shop, I can confirm it was indeed a wiring issue similar to what you described. The car diagnostics showed the water sensor itself was fine, just needed the connections cleaned and sealed properly. Total repair came to 120€ including labor, which was a relief since I was worried about needing a complete sensor replacement. The mechanic performed thorough sensor testing and found some moisture had gotten into the connector housing, causing the electrical fault. They cleaned it, applied dielectric grease, and properly sealed everything back up. Engine runs perfectly now and the check engine light has stayed off. Really appreciate the heads up about checking the wiring first. Saved me from potentially overpaying for unnecessary parts replacement. Will definitely keep an eye out for any recurring sensor fault issues, but so far everything is working as it should.