Reduced Fuel Economy in Winter
The Nissan Rogue is experiencing a drop in fuel economy during winter. This is common due to factors like cold engine operation, increased idling, and winter fuel blends, but could also indicate underlying issues such as faulty thermostat, oxygen sensor, or tire pressure problems.
Diagnosis Details
Possible Causes
Cold weather effects: Engine takes longer to reach optimal temperature, winter fuel blends have lower energy content, and increased use of heaters and defrosters.
Underinflated tires: Cold air reduces tire pressure, increasing rolling resistance and fuel consumption.
Faulty engine coolant thermostat: Stuck open prevents engine from reaching proper operating temperature, causing rich fuel mixture.
Oxygen sensor malfunction: Incorrect readings can cause the engine to run rich, reducing fuel economy.
Winter idling: Extended warm-up idling consumes fuel without mileage.
Related OBD-II Codes
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What You Should Do
Check and adjust tire pressures to recommended cold PSI.
Avoid excessive idling; drive gently until engine warms.
If issue persists, have a mechanic test the thermostat and oxygen sensor, and inspect for any stored diagnostic trouble codes.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
