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Joined: May 2002
Posts: 7
Junior Member
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OP
Junior Member
Joined: May 2002
Posts: 7 |
hi all:
Mercury Mystique 96 2.0L
I need some help on a steady CEL
error code = 0171 System too lean Bank 1
Any remedies ??
or does it need further testing. I would appreciate if someone could point me in right direction.
Also,
how do you reset the CEL ? Can you just disconnect battery and push brake pedal 10-15 s to completely drain current in circuit,
or do I need to go to dealer.
thanks,
Hugues -
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Joined: May 2002
Posts: 311
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Joined: May 2002
Posts: 311 |
I wouldn't worry too much if the car is running okay. As far as resetting the CEL, disconnect the battery for 15 mins, then drive it at low speeds for a while after. there is a complete 're-boot' proceedure available at Blue Oval, but I don't think it's completely nessesary. The car will recalibrate quickly on it's own. If the light comes back, disregard my comments and ask someone who knows more than I do about coding. 
1998 Contour Sport V6, Black
*Cold air induction
*Powdercoated intake manifold (more powdercoating coming soon)
*Blue headlights, foggies, and signals (no reflectors)
*CEG stickers & removed door moldings
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1994 Ford Aspire 4-door, looks like a big egg
*64 hp 4-cyl
*5 speed
*"13 steel rims with go-cart tires
*74 mph top speed
*I'm going to auto-x the thing (but not compete)
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Joined: Dec 2001
Posts: 237
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Joined: Dec 2001
Posts: 237 |
The following is from the Ford Technical Service Publication CD:
Diagnostic Trouble Codes (DTCs) P0171 bank (1) (cylinder #1) and DTC P0174 bank (2) indicate the fuel/air ratio is too lean. The fuel adaptive system is at the rich correction limit.
Possible causes:
Fuel system
-- Excessive fuel pressure.
-- Leaking fuel injector(s).
-- Leaking fuel pressure regulator.
-- Low fuel pressure.
-- Contaminated injector(s)
Induction system
-- Air leaks after the MAF.
-- Vacuum leaks.
-- Restricted air inlet.
-- PCV system.
-- Fuel purge system.
-- Improperly seated dip stick.
EGR
-- leaking gasket.
-- Stuck open EGR valve.
-- Leaking diaphragm.
Base engine
-- Oil overfill.
-- Cam timing.
-- Cylinder compression.
-- Exhaust leaks before or near the HO2S's.
* Check air intake for leaks, obstructions and damage.
* Check air filter, air filter housing for blockage.
* Verify integrity of the PCV system.
* Check for vacuum leaks.
1996 Contour SE Sedan 4D (Royal Blue)
Duratec V6 2.5L 24-valve DOHC
Automatic
75,000 miles
No Mods (unless you call the DMD a mod)
Replaced EGR valve (gunked up), EVR (EGR VR), PCV valve, and evaporative emissions hose (cracked).
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Joined: Mar 2002
Posts: 1,040
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Member
Joined: Mar 2002
Posts: 1,040 |
Pulling fuse 11 in engine compartment fuse box for a couple of minutes resets CEL.
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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Joined: May 2002
Posts: 7
Junior Member
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OP
Junior Member
Joined: May 2002
Posts: 7 |
Thank you all for your input. After I had posted, I found quite a few posts about the subject. Sorry about that.
In any case,
I replaced the pre-cat o2 sensor and cleaned up the MAF sensor. The CEL has not come up yet after 20 miles, so maybe it is fixed.
Hugues -
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