NHTSA Complaint #11708419 — 2012 HONDA CIVIC

Component or system failure: The vehicle experienced failures involving the engine/ignition system, emissions system, Vehicle Stability Assist (VSA), and power steering. On July 14, 2025, warning messages appeared for “Check Emissions System,” “Check VSA System,” and “Check Power Steering System.” Diagnostics identified engine misfire code P0304 (Cylinder #4). On August 11, 2025, an authorized Honda dealership confirmed a seized spark plug and cylinder head damage, indicating an internal engine defect. The vehicle is currently with the selling dealership and available for inspection. Safety risk: Simultaneous failure warnings for emissions, VSA, and power steering created an unsafe driving condition. Impaired stability control and power steering increase the risk of loss of vehicle control during turning or emergency maneuvers. Confirmation of problem: Yes. Independent diagnostics confirmed the misfire. The selling dealer attempted repairs between July 22–25, 2025, but the same warnings returned. On August 8, 2025, the dealer admitted it lacked tools and software to diagnose or repair CNG vehicles. Honda later confirmed internal engine damage. Inspections: The vehicle was inspected by the selling dealer and an authorized Honda dealership. A third-party warranty administrator authorized a tear-down inspection. The vehicle has not yet been inspected by Honda Motor Co. or NHTSA. Prior warnings and recall concern: Warnings first appeared on July 14, 2025, about two weeks after purchase, and recurred despite repairs. The 2012 Honda Civic CNG has multiple recalls involving engine, fuel, and emissions systems, and these failures are consistent with known defect patterns, warranting further investigation.