OBD-II codes PO 172 & PO 175 WTF? | 4.6L Based Powertrains

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#635969 - 01/31/05 05:34 AM OBD-II codes PO 172 & PO 175 WTF?
Bryan_S. Over the Hill Registered: 04/29/01 Posts: 3217	These codes are for "System to rich" Banks 1 & 2. Well , this may explain why I am using so much gas. I just don't know what is tripping the codes. My only guess is so far that I had lost an exaust donut and was running for about 2 weeks with the driver side pipe unattached simply because I was not going to mess with it in -20 weather. Recently got it back together. Few days alter these codes. Is the computer trying to get used to the exaust being fully functional again after "getting used to" haveing it the other way? I'm going to disconnect my battery when I get home for an hour or 2 then try it again to see if clearing it all and resetting will helps. Any theories? Bryan _________________________ sig is too long, reduce please -jt
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#635970 - 01/31/05 09:02 AM Re: OBD-II codes PO 172 & PO 175 WTF?
JBLU24 n00b Registered: 03/09/04 Posts: 14 Loc: NYC	http://www.obd-codes.com/trouble_codes/index.php
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#635971 - 01/31/05 04:39 PM Re: OBD-II codes PO 172 & PO 175 WTF?
Islandvic2 Climber Registered: 01/07/05 Posts: 742	I had same codes. I cleaned MAF and replaced both before cat 02's. Problem never came back. Fuel efficiency went up afterwards. My experience may be different from yours though. Good luck. _________________________
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#635972 - 01/31/05 09:48 PM Re: OBD-II codes PO 172 & PO 175 WTF?
Rogerm60 Member Registered: 01/15/03 Posts: 211 Loc: Zinzinnati	Check fuel pressure and the ECT too. _________________________ 2006 P71, Black on Black. Installing camera system and getting road ready.
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#635973 - 01/31/05 10:34 PM Re: OBD-II codes PO 172 & PO 175 WTF?
1BADMERC Over the Hill Registered: 08/31/04 Posts: 3645	Sounds like it could be an O2 sensor issue _________________________ 1993 GM LS 243k miles 29.5mm PI front bar(ENS greaseable poly bushings),21mm HPP rear bar(ENS poly bushings/endlinks),Mechanical Stewart-Warner oil pressure gauge. Black steelies/center caps...K&N filter 1994 Lincoln Mark VIII 144k miles All airbags switched to coils/struts, junk tranny, motor donor car Mercury Owners Group This is a disclaimer: This post is the opinion of the person in question. It is presented as nothing more than that. Furthurmore, this opinion is is not necessarily the opinion of CVN, any of its affiliates, or anyone else on Earth.
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#635974 - 02/01/05 01:07 AM Re: OBD-II codes PO 172 & PO 175 WTF?
Steve83 Poobah Registered: 10/03/04 Posts: 7454 Loc: Memphis, TN 38060, USA, Earth,...	See if there's gasoline in the red vac line to the FPR. _________________________ Walk softly & carry a BIG SIX ! ! ! . . .
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#635975 - 02/01/05 01:39 AM Re: OBD-II codes PO 172 & PO 175 WTF?
Bryan_S. Over the Hill Registered: 04/29/01 Posts: 3217	I'll clean the mass air sen tommorow. I had an exaust leak on the drivers side and the obd codes site above listed an exaust leak before the 1st O2 sensor. This was fixed almost 2 weeks ago though and I have erased the codes 2x up to this date and they keep coming back. God, I hope it's not the O2 sensors..... Bryan _________________________ sig is too long, reduce please -jt
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