It could be a faulty transmission solenoid or the oil level is to low. or weak and needs replacing. it could also be a blocked filter, it can even be the switch, this tells the solenoids through the auto box control unit what gear to select. the switch could be dirty or become out of line. there is a lot that can be the problem, but if it's ready for its oil and filter to be changed, then start this first as its always best to change the oil and filter.
Stop don t add treatment if you want to keep it, yes it might make it work for a week or two. if it is over 35000 mile from fuild change. change filter and half the fiuld.
SOURCE: O2 sensor problem, running rich. Please help
was the code for rich or lean? may try cleaning mass air flow sensor. it is in the air intake tube and has a flat wire connector. take out of tube and take four torx bolts out and clean with mass air flow cleaner or brake cleaner and put back in when dry. or it could be a bad wire on the o2 harness. look for chaffing or broken wires in harness by o2. also could be the exhaust system has a slight blockage. could also be some other things but try these first.
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