# P1443, P0174 Ford Thunderbird

**URL:** <https://community.cartalk.com/t/p1443-p0174-ford-thunderbird/20607>\
**Category:** Maintenance/Repairs\
**Created:** [October 11, 2008, 2:04pm UTC](https://community.cartalk.com/t/p1443-p0174-ford-thunderbird/20607 "2008-10-11T14:04:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![DblDogDare](https://avatars.discourse-cdn.com/v4/letter/d/8edcca/32.png) [@DblDogDare](https://community.cartalk.com/u/DblDogDare)\
**Post date:** [October 11, 2008, 2:04pm UTC](https://community.cartalk.com/t/p1443-p0174-ford-thunderbird/20607/1 "2008-10-11T14:04:59Z")

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As always, any/all help is greatly appreciated.  
  
 I have 1997 Ford Tbird, 4.6L with (2) service codes. P1443, “No Definition Available”. I had this code about a year ago, and had a mechanic look into it. He said it is typically an Evap code related to the fuel vacuum system. He recommended replacing the fuel cap, which I did. This did not correct the problem. I took it to the mechanic, where he found that the Evap canister was full of gasoline. He replaced that with a used canister from a Mustang that was being parted out. The code did not come back for several months. It is back. I am contemplating a replacement of the evap purge valve. Any thoughts on this?  
  
 More recently, I have a P0174 code, “System too lean(bank 2)”. The engine is pinging on acceleration, and runs a bit rough. I believe this is pointing to an oxygen sensor, but not too sure. Again, any thoughts and ideas are appreciated.

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [October 11, 2008, 3:39pm UTC](https://community.cartalk.com/t/p1443-p0174-ford-thunderbird/20607/2 "2008-10-11T15:39:58Z")

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You need your mechanic to do some troubleshooting, or, another mechanic. He may be great in changing parts; but, that’s inadequate when the problem is more complex than that. Here is a little article on your problem: [http://free-auto-repair-advice.blogspot.com/search/label/EVAP%20codes](http://free-auto-repair-advice.blogspot.com/search/label/EVAP%20codes)  
DTC P1443 is defined as:Evaporative Emission System Control Valve has low or no flow.  
DTC P0174 is defined as you stated: System too lean on bank 2 (LEFT side) of the engine. This DTC may be a result of DTC P1443. Yep. If vacuum is leaking, through a hose, a valve, or elsewhere, allowing unmetered air to go to the cylinders nearest the leak, you could get those codes. Uncontrolled air flow (“leaks”) upset the air/fuel mixture going into the engine.