# More of the '03 Taurus problem (water leaking) + more now

**URL:** <https://community.cartalk.com/t/more-of-the-03-taurus-problem-water-leaking-more-now/39438>\
**Category:** Maintenance/Repairs\
**Tags:** sensors, ford, taurus, gasoline\
**Created:** [November 13, 2009, 8:18pm UTC](https://community.cartalk.com/t/more-of-the-03-taurus-problem-water-leaking-more-now/39438 "2009-11-13T20:18:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![nico1et](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nico1et/32/288_2.png) [@nico1et](https://community.cartalk.com/u/nico1et)\
**Post date:** [November 13, 2009, 8:18pm UTC](https://community.cartalk.com/t/more-of-the-03-taurus-problem-water-leaking-more-now/39438/1 "2009-11-13T20:18:26Z")

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this was discussed in another thread, but there’s been more developments that i’m now concerned about, & don’t know how these fit into the overall picture.  
  
 ([http://act…ge#2655685](http://community.cartalk.com/posts/list/2131849.page#2655685))  
  
  
  
 [as a reminder, i had this minor work done very recently: oil change, tire rotation, air filter, & windshield wiper change within last couple weeks - i am always suspicious after i have a garage do anything, especially if something else goes wrong the next day, or week.]  
  
  
  
 this taurus (ses) has about 47,000 miles on it.  
  
  
  
 i haven’t gotten to look into having the a/c hose blown out (or whatever needs to be done), & my engine light went on the same day i had been getting responses to the passenger floor water issue.  
  
  
  
 i went to auto zone, & this is the (confusing) reading i got. (i would have thought it would be related to my water problem, but looks like something else completely? isn’t the timing rather strange tho?)  
  
 ================================  
  
 Reading:  
  
  
  
 TROUBLESHOOTING PO171  
  
 Definition  
  
 Fuel trim bank one condition  
  
 Explanation  
  
 The powertrain control module uses the oxygen sensor to calculate the Air/Fuel ratio of the engine. The computer has recognized a rich or lean condition on one engine bank only.  
  
 Probable cause  
  
 1. - If bank one and two codes set together suspect fuel pressure or MAF (Mass Air Flow) sensor  
  
 2. - Oxygen sensor defective  
  
 3. - Ignition misfire-repair  
  
 4. - Fuel injector problem  
  
  
  
 TROUBLESHOOTING PO174  
  
 Explanation  
  
 The ECM has detected a rich or lean Air/Fuel ratio condition on engine bank two.  
  
 Probable cause  
  
 1. - If bank one and two are set together suspect fuel pressure or MAF sensor fault  
  
 2. - Failed HO2521 (Heated oxygen sensor - Bank 2 Sensor 1)  
  
 3. - Ignition misfire condition  
  
 4. - Fuel injector problem  
  
 5. - Engine mechanical condition  
  
 ================================  
  
 the guy at auto zone said the mass air flow sensor part is $130, & said it’s easy to replace (well, not for me!)… but suggested using fuel system cleaner (& possibly air flow sensor spray) first before doing that other repair.  
  
  
  
 i am very confused… why is all this happening right after i took my car in for minor work? could any of it be related to that?  
  
  
  
 also… this isn’t in any way related to my wet floor, correct?  
  
  
  
 i’m baffled, & calling on you guys as usual.

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<div class="post-metadata">

**Author:** ![nico1et](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nico1et/32/288_2.png) [@nico1et](https://community.cartalk.com/u/nico1et)\
**Post date:** [November 14, 2009, 7:22pm UTC](https://community.cartalk.com/t/more-of-the-03-taurus-problem-water-leaking-more-now/39438/2 "2009-11-14T19:22:08Z")

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sorry - i retitled this one MASS AIR FLOW & wanted to delete the one above, but can’t see how. maybe i’m missing something. if someone knows how i can delete the one above, i’d appreciate any pointers. thanks.