Trying to figure this out, as to why I threw a P1448 code. Car stored for winter, sunny spring day so fired it up (did same last week), and today, while it idled in the driveway, it threw a P1448 code. My bypass valve operates fine, but soon as it warmed up to operating temp, fans came on,and sometime while my back was turned, it threw this code. Could it be a goofed up probe at the bypass valve or? Aftermarket headers, cats, Tubi exhaust.. had this code a couple times last summer, so trying to figure it out before spring comes.
