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Joined: Oct 2004
Posts: 319
CEG\'er
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OP
CEG\'er
Joined: Oct 2004
Posts: 319 |
Need some advice...
I just had a CEL come on recently. I scanned the code and P0174 came up. System too Lean (bank 1). I checked the intake system for leaks etc, and all looks well. Throttle body is clean, MAF is clean. Would the next step be to replace the front upstream 02? Just wanted some advice before placing the order on the sensor. Car has 59,000 miles.
Thanks!
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Joined: Jun 2005
Posts: 5,345
Addicted CEG\'er
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Addicted CEG\'er
Joined: Jun 2005
Posts: 5,345 |
P174 is System too lean (Bank 2). There is a TSB 01-9-7 which outlines the following for P0174. I have a hardcopy printed. Don't know if the link still works. http://www.v8sho.com/SHO/TSB0197HO2SServiceTips.htmIf the link doesn't work, try http://www.v8sho.com/SHOand then scoll down for the TSB Good luck
"Always do the cheap and easy ones first."
1996 V6 ATX 96K miles
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Joined: Oct 2004
Posts: 319
CEG\'er
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OP
CEG\'er
Joined: Oct 2004
Posts: 319 |
thanks! I will have a look at that.
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Joined: Oct 2004
Posts: 319
CEG\'er
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OP
CEG\'er
Joined: Oct 2004
Posts: 319 |
just curious, if my EGR valve were sticking, would I not get an EGR low flow code before the P0174?
from what I gather, the P0174 code is not flagging 02 sensor failure but failure of a component that causes the mixture to go lean, ie vacume leak, egr etc.
thanks
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Joined: Oct 2000
Posts: 770
Veteran CEG\'er
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Veteran CEG\'er
Joined: Oct 2000
Posts: 770 |
If the EGR was sticking open the engine would run real bad at idle. With that many miles it time to think about replacing the O2 sensors. There is a test procedure you can run it through that on the web (can't find at present) which requires removing the sensor, heating it with a torch and scoping it. If the sensor is working OK, the problem may still be lean condition caused by bad gaskets in the intakes, etc. You can find a ton of posts on this bug. I had one caused by a torn PCV hose on the cam cover. 
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Joined: Oct 2004
Posts: 319
CEG\'er
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OP
CEG\'er
Joined: Oct 2004
Posts: 319 |
yeah, they are the hardest to diagnose and fix...I replaced the pvc. doing the 02 tomorrow. I am hoping that is what it is.
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Joined: Dec 2001
Posts: 6,910
Hard-core CEG'er
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Hard-core CEG'er
Joined: Dec 2001
Posts: 6,910 |
O2 sensor is gone, replace it. had a P0171 on my mothers car and replacing the noted sensor for that code cleared it up
if there was a intake leak or something like that both banks would be lean
- 95 Mystique LS - Zetec/5spd
- 99 Contour SeVT Sport - Duratec/5spd
Official NE-CEG Contour/Mustang Family
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Joined: Oct 2000
Posts: 770
Veteran CEG\'er
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Veteran CEG\'er
Joined: Oct 2000
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Unless it's a leak around the injector(s)
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Joined: Jul 2001
Posts: 7,100
Addicted CEG\'er
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Addicted CEG\'er
Joined: Jul 2001
Posts: 7,100 |
or right at said sensor (not likely)
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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