Volvo XC90 reduced power issue with warning light and replaced coils on Volvo XC90

Some Volvo XC90 owners report experiencing reduced power issues accompanied by warning lights, such as the "Reduced Engine Performance" message, even after replacing ignition coils. Common symptoms of bad ignition coils include engine hesitation during acceleration, rough idle, misfires, and excessive fuel consumption, which may also trigger the check engine light. Many owners find it beneficial to replace spark plugs alongside ignition coils, especially if the plugs show signs of wear. Utilizing an OBD-II scanner is recommended to read fault codes and diagnose underlying issues within the engine system. Additionally, regular inspection and replacement of spark plugs can help maintain engine performance and prevent misfires. Other factors that may contribute to reduced power include air filter conditions, fuel system maintenance, and checking for blockages in the soot filter. Addressing engine wear and tear, such as replacing the timing belt, is also crucial for optimal performance. Furthermore, checking electronic sensors like the mass airflow sensor and oxygen sensors is essential, as faulty readings can exacerbate power reduction problems.