2nd Gear Member
Join Date: Dec 2004
Location: Vancouver, Canada
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P0172 code mean-"system is too rich"(not enough air comes to engine)
It could be faulty or dirty MAF sensor.The use of "oiled",cone type air filters can cause the MAF to become dirty if the filter is over-oiled. It could be very dirty regular air filter(when did you change it last time?) It could be a fuel pressure or delivery problem(dirty fuel filter or faulty fuel pressure regulator)
Start with these simple solutions.I personally doubt ,that oxygen sensor is faulty.It only gives you indications of limited air in the system.
Good luck !
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