SuperMotors.net Forums
jjk
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• eastern, KS, USA |
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• Registered on 1/16/2011 |
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• 3 posts |
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 Posted:1/16/2011 10:03 |
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I have a 99 Crown Vic LX which is throwing the following codes:
P0174 System Too Lean (Bank 2)
P0171 System Too Lean (Bank 1)
P0307 Cylinder #7 Misfire Detected
P0305 Cylinder #5 Misfire Detected
P0303 Cylinder #3 Misfire Detected
P1131 Lack Of HO2S11 Switch - Sensor Indicates Lean
P1151 Lack Of HO2S21 Switch - Sensor Indicates Lean
P0136 Heated O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)
P1415 Air Pump Circuit Malfunction
It normally runs like a dream with 215,000 on the clock. I am losing power. I have new plugs and ignition coils on all 8 cyl.
I am told that I have an oxygen sensor problem but, how do I know which one? I don't want to spend $60 for a scan but, the free scans at Auto Zone won't tell me which one is the problem. The sensors run $40 or so a piece but, I just want to replace the bad one for right now.
It's colder than all get out with snow on the ground so I am trying to find the "easy button" on this. Is there one?
Are the oxy sensors easy to get to or???
Thanks!
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jdmeaux
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• Lafayette, LA, USA |
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• Registered on 1/5/2009 |
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• 525 posts |
• 1 Vehicle
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Posted:1/16/2011 17:50 |
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P0171 and P0174 indicate excessive air into system---possibly an air leak. Check hoses and gaskets::::also, both together could be a MAF that needs cleaning.
The oxygen sensors are two per side. Closest to the exhaust manifold is #1 and reads air flow;the one furtherest away is #2 and measures leanness.
Try cleaning your MAF with brake cleaning fluid spray first. Then start checking for a leaking hose or gasket (the engine will speed up when the starting fluid is sucked in.
*******************
PROUD MEMBER of www.crownvic.net
It's just a SUPER-DUTY Mustang GT Sedan. 198K miles and still rolling HARD.
1997 Crown Victoria P71 SVT *** ex-US Marshall service (the CAR)
STOCK?? I bet it was modified. 
13.26 @ 107.24 MPH 1/4 mi w/ me, tools, & full tank of 93 octane
I added CAI, NICHE 19 X 8.5 " wheels with 245/45ZR 19 rubbers, and completely rebuilt the front end with poly bushings, Kooks headers, 2 1/4inch exhaust, TCI 2200-2400 rpm Stall converter
.PLANS:: engine upgrade, 5.4L 2v stroker, rebuild interior in leather w/ buckets, thinking about turbos
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jjk
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• eastern, KS, USA |
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• Registered on 1/16/2011 |
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• 3 posts |
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Posted:1/16/2011 19:12 |
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Thanks jdmeaux,
I am going to go ahead and replace the up stream oxygen sensors as they are the originals and at 215,000 miles I surely got my money's worth out of them.
I have suspected a vac leak but, never felt I could hear anything becasue of the engine noise. I did pop the plastic cover and do a visual from above the engine compartment but...that leaves a lot of uncovered ground.
Any other tips about finding vac leaks?
Have a great eek and thanks again!
John
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