help!engine missing code says too lean
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help!engine missing code says too lean
My service engine light has been on for a few days with no noticable side affects.Then yeaterday it went off and then came back on about 5 minutes later and started missing.everytime it has done this it has been an ignition coil.I have already replaced them on 5 of the cylinders.Well i went to the auto zone to get the code read just to see and it gave me this code-po442,po171.
one of them is an emisson leak the other said engine too lean.
Any idea what this is.Does it mean i have a bad fuel injector?I had the fuel filter replaced last year.If anybody has any ideas let me know.I/m planning on taking it to the mechanic after the weekend but I would really like to know what this is in case i can fix it myself.
99 F150
5.4 Triton V8
4x4 supercab lariat
k&n
285/75/16 Nokians-15.1mpg
(flowmasters next month)
one of them is an emisson leak the other said engine too lean.
Any idea what this is.Does it mean i have a bad fuel injector?I had the fuel filter replaced last year.If anybody has any ideas let me know.I/m planning on taking it to the mechanic after the weekend but I would really like to know what this is in case i can fix it myself.
99 F150
5.4 Triton V8
4x4 supercab lariat
k&n
285/75/16 Nokians-15.1mpg
(flowmasters next month)
