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Old 04-22-2009, 03:14 PM   #1
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P0171 cel code?

I have an '03' focus with 92000 miles and P0171 is the code for the cel thats on. Was told that means it's running lean so I put a fuel filter on since it needed to be done anyway. The lights still on and it seems to lose power sometimes when i'm driving. Any idea what could be causing it? Newbie to this site, this is my 1st post so I appoligize if this topic has already been covered. Thanks for any help!!!


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Old 04-22-2009, 03:18 PM   #2
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Check for vacuum leaks after the MAF, including the PCV hoses, e.g., cracked, loose, collapsed, etc.
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Old 04-22-2009, 03:52 PM   #3
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Welcome to the site!

My first thoughts would be the same as stated above ^^

But here are some other potential causes:

P0171 - System to Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. For lean and rich DTCs:
Fuel system
Excessive fuel pressure.
Leaking/contaminated fuel injectors.
Leaking fuel pressure regulator.
Low fuel pressure or running out of fuel.
Vapor recovery system.
Induction system:
Air leaks after the MAF.
Vacuum Leaks.
PCV system.
Improperly seated engine oil dipstick.
EGR system:
Leaking gasket.
Stuck EGR valve.
Leaking diaphragm or EVR.
Base Engine:
Oil overfill.
Cam timing.
Cylinder compression.
Exhaust leaks before or near the HO2Ss.
A SHRTFT-1,2 PID value between -25% to +35% and a LONGFT-1,2 PID value between -35% to +35% is acceptable. Reading beyond these values indicate a failure.


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Old 04-22-2009, 05:16 PM   #4
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I had that code a few weeks back. I went out and got some MAF cleaner, cleaned my MAF and re-set the computer. Problem solved for me.
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Old 04-22-2009, 05:48 PM   #5
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Thanks for all the feedback. I checked the hoses & from what I can tell they all look good. Where is the MAF located & does it need to be removed to clean it? Will the cel go out on its own once the problem is fixed & if not how do I reset it?
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Old 04-22-2009, 06:05 PM   #6
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I just disconnect the battery and then turn my lights on or try to start the car to drain whatever was left. Then reconnect and start. Let the car idle for a few mins then drive has normal. See if the code pops back up. If it does time to do more trouble shooting. Your fuel injectors could be dirty or the MAF sensor. Try the cheaper fixes first. You can get MAF cleaner at the auto parts store. Just make sure its Mass Airflow Sensor cleaner and not electrical cleaner
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Old 04-22-2009, 06:10 PM   #7
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my SVT threw that same exact code and would loose power like you were describing when I had a bad front o2
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Old 04-23-2009, 10:17 AM   #8
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Quote:
Originally Posted by penguin View Post
Check for vacuum leaks after the MAF, including the PCV hoses, e.g., cracked, loose, collapsed, etc.
2x, pcv hoses & elbows very prone to cracks
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Old 04-23-2009, 12:30 PM   #9
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Im having the a similar problem with my focus... Im throwin that code but i really dont have any symptoms....

Gas Mileage is the same, no power loss, my car stumbles a taddddddd at idle.

All i have checked was my SR intake and there doesnt appear to be any problems with it.

Sleepboy mention you have to clean the maf with that type of cleaner..why not electrical cleaner?

How about running fuel system cleaner through a tank of gas?

How do i know if my front o2 sensor could be bad?
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Old 04-23-2009, 02:25 PM   #10
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> Im throwin that code but i really dont have any symptoms....


Check really, really, really carefully for vacuum leaks.


Seriously, there are other reasons that code can be thrown, but the vast majority of the times it is a vacuum leak. People will do a quick check, say no vacuum leak, do a bunch of other stuff, and then as a last resort really check carefully and find a leaky or collapse hose.

Now, maybe you have really checked carefully for a leak and there isn't one. But it is worth the time to check really carefully before ruling out a vacuum leak.
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