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bad need of a tuneup? like new spark plugs, ?
172 , is 02 rich/ lean warning. this one is low oxy for rich.
this code can just be a victim. for sure , with misfire.
means 02 sensor stuck at rich,
what is water temp in engine coolant, at failure? less than 150F?
could be lots of things.
leaking injectors, bad fuel.
injector sticking> causing misfire.
id use a scan tool and watch all sensor when it fails.
too high fuel pressure.
misfires cold, but only luke warm cold starts not fully cold.
just one DTC, no P0300 or 30x misfire codes, not even P0300 pendings?
Sounds to me that you may have a vacuum leak or leaks.
You can spray starting fluid,spareingly on and around the intake while the car is running.
And look and listen for the engine to rev up, replace and or tighten hoses or gaskets.
Be careful to not have anything,loose fitting to get tangled up while the engine is running.
misfire could happen if you have a leak in the intake or exhause valve , or if your engine running rich thats mean too much fuel coming to the engine . you should check oxygen sensor
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