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Generally if it cranks good but won't start, have a helper crank it while you check for spark at the plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse. How long since a tune up any applicable trouble codes?
Make sure the battery has a full charge.
Engine sensor , ignition control sensor ! Is the vehicle check engine light on ? Do you have a scan tool to check engine sensor data ? Do you have a DVOM - digital volt ohm meter ? any sensor that is powered by the PCM - engine computers five volt reference voltage circuit . 5 volt reference or crankshaft postion sensor . Doing testing is the way to find the problem .Check out videos on ignition system testing .
Well code 171 is telling you the fuel mixture is too lean for bank one and code 174 is too lean bank two.
So the most common cause is low fuel pressure.
I would suspect the fuel is the problem, most likely water is in the fuel, but get the codes read to see what fault shows up that turned on the check engine light.
It's under the car. It most likely has a splash shield covering it, and you might have to remove that first. Usually it will be towards the rear of the car, and near the fuel tank.
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