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1979-2004 V6 Mustang Tech Discussions

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Unread 08-15-2011   #1 (permalink)
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Default 1998 Ford Mustang check engine code P1151 could it be a bad MAF sensor?

I have 1998 ford mustang six cylinder 148,000 miles check engine light is on, code auto zone gave me was P1151 along with read out of possible causes. When light came on car did not do anything at all, ran same as it was with light off. I replaced vacuum line that ran from air intake too the opposite side of the engine, because I remember it looking bad when I tuned the car up few months ago. I replaced air filter and unhooked battery to reset the check engine light. I put about 180 miles on car check engine light came back on, again car was running just as it did with light off. Is it possible that my MAF sensor is bad, or could it be bad fuel pressure? I was thinking with bad fuel pressure the car would run funny? Iím not no auto mechanic and without taking it to a garage I have no way of testing fuel pressure.
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Unread 08-15-2011   #2 (permalink)
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maf sensors are a pain... if they are dirty your car will run bad. Try cleaning that gently inside and clean the actual sensor but make sure you let it dry good. start there and eliminate the cheap things first
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Unread 08-15-2011   #3 (permalink)
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P1151 Means Lack of Upstream Heated Oxygen Sensor Switch.
Could be a bad O2 Sensor. You should check your O2 sensors and see if any of them need replacing.
Also make sure Mass airflow sensors are clean. it could be a vaccum leak also making the sensor pick up a lean mixture.
check the Engine idle, EGR, Fuel System and Air Induction System.
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Unread 08-15-2011   #4 (permalink)
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The most common cause of this DTC is vacuum leak or exhaust leak. For the V6 and a code affecting bank 2, also think exhaust leak from cracked manifold.

Consider that if the MAF were at fault, it would affect both banks. So when the DTC code is from one side, focus first on causes that can affect one side.

However, it never hurts to clean the MAF.


>>
H40 DTCs P1131, P1132, P1151 AND P1152: UPSTREAM HO2S NOT SWITCHING. DTC P1130: FUEL SYSTEM NOT SWITCHING AT FUEL TRIM (RICH OR LEAN)

HO2S-11 = DTCs P1131, P1132 and P1130
HO2S-21 = DTCs P1151, P1152 and P1150


Possible causes:
Fuel system
Excessive fuel pressure.
Leaking fuel injector(s).
Leaking fuel pressure regulator.
Low fuel pressure or running out of fuel.
Contaminated fuel injector(s)
Vapor recovery system

Induction system
Air leaks after the MAF.
Vacuum leaks (vacuum lines and gaskets).
Restricted air inlet.
PCV system.
Improperly seated engine oil dipstick.

EGR System
Leaking gasket.
Stuck open EGR valve.
Leaking diaphragm.

Base engine
Oil overfill.
Cam timing.
Cylinder compression.
Exhaust leaks before or near the HO2Ss.

To do:
Check intake air system for leaks, obstructions and damage.
Check air cleaner element, air cleaner housing for blockage.
Verify integrity of the PCV system.
Check for vacuum leaks.
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Unread 08-15-2011   #5 (permalink)
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What is location of bank 2 sensor 1. I replaced all the vacuum lines and cleaned MAF sensor reset light it came back on. Talked to my Uncleís trusted mechanic and he told me seeing how that only code Iím getting it more then likely bad sensor. The sensor really doesnít cost all that much the thing is if Iím able to get too it and switch it out myself.
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Unread 08-15-2011   #6 (permalink)
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O2 sensors are numbered using two numbers. The first is the bank:
bank 1 left hand side.
bank 2 right hand side.

The second is O2 function. 1=AF monitoring. 2=cat monitoring.

So O2-21 is the front O2 sensor on the right side.
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