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Check engine light came on for about ten seconds then went off,it did this a few times going to work.I pulled the code 173 O2 sensor not switching-system is or was rich.Changed the sensor was working good for about a month but now the check engine light comes on again but this time I get code 172 O2 sensor not switching -system is or was lean.Can something else be causing this.I really don't want to keep changing parts and not fixing the problem.
A lot of things can.
A bad Fuel Pressure Regulator (FPR).[most of the time the 173]
A bad fuel pump [most of the time the 172].
A dirty fuel filter [most of the time the 172].
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