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Hi everyone, I have a 2001 Toyota Sienna CE that failed smog due to a P1155 CEL error causing an unusually high output of nitrogen monoxide (NO) emissions. I have since cleared the code using the scanner but I am wondering if I can pass the smog without replacing the O2 sensor (Bank 1 Sensor...

Looking to upgrade, however I have heard of some experiences on how hard it is to operate one. Thoughts before I head down to the dealer?