as much as it seems those codes would by caused by o2 sensors they are almost never actually caused by faulty o2s. lean and rich codes are actually pretty difficult to diagnose properly because you need to be able to datalog what all the sensors are showing to the ecu.

being a drivability tech on fords for 8 years ive seen maf sensors cause both lean and rich but not very often.

next time it starts to run poorly go unplug the maf sensor. if it starts up and runs ok thats possibly your problem.


the battery light is likely another concern alltogether. check voltage next time it happens. if you put a reman alternator on i wouldnt trust it.