Hyundai Ioniq recurring check engine light issue with previous repairs for water in fuel tank on Hyundai Ioniq

Some Hyundai Ioniq owners report experiencing recurring check engine light issues, which can often be linked to previous repairs for water in the fuel tank. These problems may stem from a faulty ECU or ECM, leading to poor engine performance and triggering the check engine light. Common causes include improperly closed gas caps resulting in vapor leaks, and in some cases, the check engine light may indicate hybrid system problems, as suggested by the HEV triangle warning light. Owners should be aware that ongoing check engine light issues can escalate to major engine failures, necessitating thorough diagnosis and repair to prevent further damage. It is recommended that affected owners have their vehicles inspected by a qualified mechanic to address the underlying issues.