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1997 ford ranger 4.0 ohv crank but not start after sitting for a couple days


faulty O2 sensor
clogged injector. use redline or royal purple FI cleaner. All the rest are trash. (read the MDSS and you'll see. RL and RP have 4-6x the active cleaning ingredient.)
 
They probably aren't setting at the exact same time. Just both at various times. How old are you're O2 sensors? Does you code reader allow you to view long and short term fuel trims? Current status of each O2 sensor?
 

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