The P0302 trouble code on your 2020 BMW X3 indicates that cylinder 2 is experiencing misfires detected by the engine management system. The G01 X3 uses the B48 2.0L turbo in xDrive30i or the B58 3.0L turbo in M40i models. These direct-injection turbocharged engines have well-documented diagnostic characteristics at typical 2020 mileage.
2020 Engine Options
The B48 produces 248 horsepower while the B58 delivers 382 horsepower in M40i tune. Both inline engines position cylinder 2 second from the timing chain end. Direct injection and turbocharging create specific maintenance needs, particularly regarding carbon buildup and ignition component wear.
Common Misfire Causes
By 2020 mileage, carbon buildup on intake valves may be significant on direct-injection engines. Ignition coil degradation from turbo heat and age is common. Spark plug wear reduces ignition energy under boost. High-pressure fuel system components may show wear. Vacuum leaks from aging hoses and gaskets can develop.
Age-Related Considerations
The 2020 model year has accumulated meaningful mileage. Carbon cleaning may be necessary. Ignition components may be approaching replacement. Comprehensive diagnosis should consider age-related factors alongside component failures.
Symptom Recognition
The compact SUV displays rough idle, vibration, and hesitation with misfires. BMW's xDrive responds to power variations. Check engine light accompanies the condition.
Repair Solutions
Replace spark plugs with BMW-specified units. Replace ignition coils as needed. Clean intake valve carbon through walnut blasting. Service fuel system components. Address vacuum leaks discovered during diagnosis.