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01-07-2010, 08:50 PM
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#1 | |
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AF Newbie
Join Date: Oct 2005
Location: Burke, Virginia
Posts: 30
Thanks: 0
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Codes
Hi I have codes P1151, P0300, P0174
Causing the vehicle to fail emissions. 98 expedition 4.6 Do all the codes need to be cleared and anyone else have any direction to start with troubleshooting these codes? |
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01-08-2010, 07:44 PM
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#2 | |
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Escort guy
 Join Date: Dec 2004
Location: Garfield, Arkansas
Posts: 2,486
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Re: Codes
P0300 is lean bank misfire. P0 174 is system too lean. P1151 is a heated oxygen sensor trying to correct for an overly lean condition. The overly lean condition could be caused by leaking contaminated fuel injectors, Leaking fuel pressure regulator, or Low fuel pressure.
Induction problems. Air leaks after the MAF. Vacuum leaks, PCV system, improperly seated engine oil dipstick. Stuck EGR valve, Base engine--OIl overfilled, cam timing off, cylinder compression. Exhaust leaks before H02 sensor. |
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01-11-2010, 01:37 PM
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#3 | |
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AF Newbie
Join Date: Jan 2006
Location: Fieldsboro, New Jersey
Posts: 36
Thanks: 0
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Re: Codes
Check the vacuum line on the back of the intake manifold. These are known for this line aging and splitting creating a severe vacuum leak and causing the codes especially the PO174
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01-11-2010, 01:54 PM
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#4 | |
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AF Enthusiast
Join Date: Mar 2008
Location: garner, North Carolina
Posts: 3,579
Thanks: 86
Thanked 100 Times in 100 Posts
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Re: Codes
Do a Google ''Youtube Auto smoke test''
This test will find your unmetered air leaks on your Intake, EGR + PCV systems. Watch the bad vacuum video. |
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