NHTSA Complaint #11674768 — 2016 VOLKSWAGEN TIGUAN

Subject: Known Carbon Buildup Issue in 2016 Volkswagen Tiguan TSI – Request for Recall and Accountability To Whom It May Concern, I am writing to formally express my concern and request action regarding a well-documented and dangerous issue affecting Volkswagen TSI engines—specifically, severe carbon buildup. I am the current owner of a 2016 Volkswagen Tiguan TSI, which I purchased in April 2025 with approximately 84,000 miles on it. In June 2025, I had to have the intake manifold replaced due to carbon buildup—a repair that was still covered under warranty. However, shortly after, I was informed that the vehicle now requires a full engine decarb and replacement of all four fuel injectors, at a total cost of $3,296. This raises several serious concerns: •Carbon buildup this severe at such low mileage is not typical wear and tear. It indicates a design flaw in the TSI direct-injection engine. •My extended warranty provider refuses to cover the repair, citing that it is a maintenance issue—conveniently shifting the responsibility away from the manufacturer. •This type of engine failure can result in dangerous performance issues, including: •Sudden engine misfires •Loss of power while accelerating •Poor fuel economy •Stalling or hesitation while merging or turning •Catalytic converter damage •Potential long-term engine failure I am stunned that this is not considered a safety issue worthy of recall, especially given the number of reports online and in service centers regarding this exact problem. The symptoms of carbon buildup can easily result in on-road danger to the driver and others. What’s most disheartening is that Volkswagen has long been aware of this flaw, yet no recall or extended warranty has been offered for affected consumers. I previously owned a 2015 Passat and was a loyal VW owner—but now, as a single mother, I am expected to pay nearly $3,300 for a repair tied to poor engineering and design, not misuse or neglect.