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Discussion Starter · #1 ·
i noticed when i bought the van that the gas mileage was poor about 14 mpg so i replaced the o2 sensor and fixed the prob. got about 23-24 mpg not to long after that the head gasket blew when i replaced it i was back down to around 14 mpg so i figured the o2 was contaminated and replaced it again which fixed it. now for no reasin i can think of im back down to 14 mpg all three times got codes 21 51
is there anything else that might be causing this
 

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Discussion Starter · #4 ·
i went ahead and put another o2 sensor in and the gas mileage is back up to around 23 mpg and for the first couple of days no codes i checked yesterday and good ol code 51 is back which usually meens 21 will be following and the gas mileage will drop again what the hell is causing this
 
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