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Old 07-13-2007, 17:33   #1 (permalink)
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99 Ford F150, OBD II Code, P1151?

Hello All,

Bran new to this board, my apologies if this question has already been beaten to death. I did a search an did not find any info on this.

My question is I have a 99 F150, check engine light came on, went to Advanced Auto and they plugged their scanner into my OBD II plug and they say the code is a "P1151 Manufacturer Control Fuel Air Metering". After doing some goggling, I found that it also is: "Bank1, Long Term Fuel Trim, Range 1 Leanness Lower Limit Exceeded" ???

Other research said:

A code P1151 may mean that one or more of the following has happened:

Electrical:

Short to VPWR in the harness or HO2S
Water in the harness connector
Open/shorted HO2S circuit
Corrosion or poor mating terminals and wiring
Damaged HO2S
Damaged PCM

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 HO2S(s)


What would you all recommend I do to try and correct this problem? Is this most likely some kind of O2 sensor or some kind of part that I can easily swap out. What would be the *most* likely cause and or solution for this type of code?

Thank you all in advance.

Tim
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Old 07-14-2007, 12:36   #2 (permalink)
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Re: 99 Ford F150, OBD II Code, P1151?

Symptoms may help.
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Old 07-14-2007, 12:58   #3 (permalink)
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Re: 99 Ford F150, OBD II Code, P1151?

No symptoms, just want to know why the *check engine light* keeps coming on and what to do about that P1151 code???

Thanks,

Tim
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Old 07-14-2007, 19:56   #4 (permalink)
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Re: 99 Ford F150, OBD II Code, P1151?

Quote:
Originally Posted by timm525@yahoo.
"Bank1, Long Term Fuel Trim, Range 1 Leanness Lower Limit Exceeded" ???
Tim
Hi Tim
That means one of the cylinder banks of your car is running so rich, that the PCM program has reached its limits trying to compensate for it, and it's unable to lean it anymore. I cannot give you any magic solutions except to approach this problem as you would any other: do the easy stuff first. It's a process of elimination.
Check first for leaks at the inlet and exhaust manifolds, vacuum leaks, condition of the fuel and air filters, fuel pressure, etc. Then if all this is good move on to the injectors and then onto the bigger stuff.
I believe that if this condition was related to an EGR or O2 sensor fault you would have the corresponding codes for each system, and not just a P1151 code. cheers

marc
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