Volvo V70 white/blue smoke from exhaust on acceleration, high crank case pressure, and P0171 code indicating possible PCV system issue on Volvo V70

Some Volvo V70 owners report experiencing issues such as white or blue smoke emissions from the exhaust during acceleration, which may indicate underlying engine problems. Specifically, white smoke can suggest water vapor, while blue smoke often points to oil burning in the engine. Additionally, some owners report high crankcase pressure, which can lead to increased blue smoke and may be influenced by the condition of the breather box and its associated hoses. Furthermore, the P0171 trouble code, indicating a lean fuel mixture, is frequently linked to potential PCV system issues, including a failed positive crankcase ventilation valve. To address these concerns, it is recommended that owners check the breather box and hoses for faults, investigate the PCV valve for failure, and conduct a thorough inspection for any oil leaks or engine problems. Consulting a qualified technician is advisable for accurate diagnosis and necessary repairs to maintain optimal vehicle performance.