HELP service engine soon light on CODE;P0174
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Old March 23rd, 2011, 11:32 AM   #1
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HELP service engine soon light on CODE;P0174


Trying to help a friend, she has a 03 mustang with 113k miles, the "service engine soon" light came on, I plugged up a code reader and it read codes P0174 and P1336, it mention something about "system too lean". I could really use some help.
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Old March 23rd, 2011, 12:28 PM   #2
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I had the same issue of"system too lean" a while back. The shop said it could be 3 things...
-bad o2 sensor
-fuel filter
-fuel pump

They assumed fuel pump, but a few days later my manifold broke off and the code was thrown by the 02 sensor reading bad due to exhaust leak
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Old March 23rd, 2011, 01:23 PM   #3
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I was told to clean the maf, so i tried cleaning all the connections and sensors by blowing em with air, erased the code and then the light popped back on, is there anything else I can try before considering buying a new maf sensor or anything for that matter?
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Old March 23rd, 2011, 01:32 PM   #4
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Get a full tune up if you havent in a long time ... oil, plugs, air filter, fuel filter, ect ect.
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Old March 23rd, 2011, 01:57 PM   #5
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1. Get MAF cleaner, spraying it with air doesn't do shit.
2. Replace fuel fitler
3. Check for fuel pump pressure.

That order.
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Old March 23rd, 2011, 03:49 PM   #6
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^^im going to try that
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