VW Taos Battery Sensor vs Weak Battery Mystery Fixed

Had a similar situation with my VW Tiguan 2020 gasoline. The symptoms matched exactly, slow cranking, dimming lights, and inconsistent battery voltage readings. The battery sensor malfunction was causing incorrect readings, making the car computer think the battery had sufficient charge when it actually needed attention. Vehicle diagnostics initially showed no clear fault codes, but a specialized battery test revealed the sensor was sending faulty signals to the charging system. The fix required replacing both the battery sensor and installing a new battery since the original was damaged from irregular charging patterns. The battery sensor issue is quite serious as it can lead to complete electrical system failure if left unchecked. Key signs that point to a battery sensor problem rather than just battery health: Inconsistent voltage readings, Battery warning appears and disappears out of nowhere, Charging system works intermittently, Low voltage warnings even with a new battery Best approach is getting a proper battery system diagnosis using advanced testing equipment. Regular voltage meters often miss battery sensor communication issues with the vehicle control modules. This is a known weak point in several VW models from that generation, and waiting too long can lead to more extensive electrical problems.

Thanks for confirming those symptoms. Your description matched my experience exactly. Since fixing mine with a sensor and battery replacement, no issues have popped up for over 8 months now. The battery testing showed much more stable readings, and the charging system works perfectly. Have you had yours fixed yet? Would be helpful to know what repair costs you were quoted. In my case, the battery charge system has been rock solid since the repair, but wondering if your mechanic mentioned any related components to watch out for.

Following up on your questions, yes, I got my Taos battery sensor issue resolved last month. The mechanic replaced the faulty battery sensor which was causing those erratic voltage readings. Total cost came to 315€ for the sensor replacement and diagnostic work. Since the repair, my vehicle diagnostics show consistent readings and the charging system works flawlessly. The battery health monitoring now displays accurate values, and those frustrating symptoms, slow cranking and dimming lights, are completely gone. The mechanic mentioned keeping an eye on the voltage sensor connections, as corrosion can sometimes develop there. They also suggested monitoring the battery health through regular checks, though the new sensor should give early warning if any issues develop. Good to hear your repair has held up for 8 months. These battery sensor problems are definitely worth fixing properly, as they can prevent more expensive electrical system damage down the line. The stable readings you mentioned are exactly what I am seeing now too.

I finally went to get it checked after putting it off for too long. The mechanic did a complete battery testing session and confirmed what we suspected, both the battery sensor and battery needed replacement. The total repair came to 420€, which included parts and labor. The battery voltage now stays consistent and all those annoying symptoms disappeared completely. The mechanic did point out some slight corrosion on the old sensor connections, which they cleaned up during installation. They also checked the alternator and other charging components to ensure nothing else was affected. Vehicle diagnostics now show everything running perfectly. No more unusual warnings or system errors. The mechanic suggested I come back in 6 months for a quick check of the sensor connections, but mentioned this is mostly precautionary given the previous corrosion. After dealing with those frustrating symptoms for weeks, the repair was totally worth it. The car starts instantly now and the electrical system works exactly as it should. Really glad I got it sorted before any bigger issues developed.