你这个应不是coolant leak, 而是汽油污染造成的。冷却液的沉积物是浅色小颗粒。你没往汽油里加过清洗剂什么的吧？对于

氧气探头上各种颜色沉积物的成因，请看以下叙述：antifreeze contamination will leave light colored grainy deposits. Black carbon deposits on the sensor tip may indicate a very rich fuel condition. White or reddish deposits indicate fuel contamination...........