P0171------ system too lean bank#1
Po174------ system too lean bank#2
For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
P0300---- Random/multiple cylinder misfire
P0316---- Cylinder misfire at start up---- first 100 revolutions.
On those 2 codes, you have to do some testing to find out why there is a misfire.
Possible causes:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure
P0171 System too lean (bank 1) P0174 System too Lean (bank 2) P0300 Random/Multiple Cylinder Misfire Detected P0316 Misfire Detected 1st 1000 revs That's what the codes are. I don't know what engine you have, whether it's a distributor or coil packs, but if you take care of the misfire (probably plugs and wires) it should take care of the lean condition. Having a bank 1 and bank 2, I'm assuming it's a V6
PO171- System to Lean (Bank 1)
PO 174-System to Lean (Bank 2)
PO300-Random Misfire
PO-316-Misfire Occurred in the First 1000 Engine Revolutions
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