o2 sensor

Discussion in '2.3 Engine' started by mcdonald58, Jul 23, 2012.

  1. mcdonald58

    mcdonald58 New Member

    what can a bad o2 sensor do to an engine. i think mine has been going bad and my check engine light has been on and off now it has stayed on for a couple of days. what damage can this cause? do i need to get it fixed asap or can i wait a month or so.
     
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  3. ob269

    ob269 New Member

    It just messes w the fuel ratio.. but that can probably cause some adverse side effects..
     
  4. OP
    mcdonald58

    mcdonald58 New Member

    so could a bad o2 sensor cause bad mpg?
     
  5. greenmachine2000

    greenmachine2000 New Member

    yes i had a bad one before, it does throw fuel off a little not severly. there easy to fix if you know what your doing.
     
  6. maranger

    maranger New Member

    to replace it, disconnect the sensor then start the truck n let it idle for five min, then unscrew the sensor (be carefull it will b hot), then put the new one in and let the engine cool then plug in the wires
     
  7. OP
    mcdonald58

    mcdonald58 New Member

    alright thanks im not sure which o2 sensor it is though. hopefully i will learn how to fix them in my auto tech class in the fall.
     
  8. maranger

    maranger New Member

    u can usually borrow a code reader from ur local parts dealer, (ADVANCED AUTO PARTS, AUTO ZONE, O'RILEYS etc..
     
  9. rwenzing

    rwenzing Bob

    A CEL can come on for any of hundreds of different reasons. It would be a good idea to get the actual trouble code before condemning a particular sensor or any other component.
     
  10. OP
    mcdonald58

    mcdonald58 New Member

    i did and got p1131 which i found to be lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1. thats how i found out it was an o2 sensor.
     
  11. rwenzing

    rwenzing Bob

    OK, that piece of information would have been helpful in the first post.

    A P1131 might mean that the oxygen sensor is bad. On the other hand, it may simply be that the sensor is reporting a real lean condition that is caused by something else.

    Oxygen sensor codes like this are not always easy to diagnose. Ford lists 22 possible causes, only 1 of which is a bad O2 sensor.
     
  12. maranger

    maranger New Member

    mcdonald how many miles u gat?
     
  13. OP
    mcdonald58

    mcdonald58 New Member

    i havent clocked it in a while but i got 12 mpg last time i did.
     
  14. maranger

    maranger New Member

    how many miles are on the truck?
     
  15. OP
    mcdonald58

    mcdonald58 New Member

    44,300 it wasnt taken care of though. i found the original spark plugs on it. i think basically the only maintenance done was oil changes.
     
  16. 44k is nothing, mine had 160k before plugs and wires were changed out
     
  17. OP
    mcdonald58

    mcdonald58 New Member

    true but when i took mine off they look terrible. they showed their age greatly.
     
  18. OP
    mcdonald58

    mcdonald58 New Member

    are there multiple o2 sensor on my truck or just one?
     
  19. rwenzing

    rwenzing Bob

    Rangers have 1, 2, 3 or 4.

    Your 97 2.3 has 2 oxygen sensors. P1131 is for the sensor that is upstream of all cats.
     
  20. OP
    mcdonald58

    mcdonald58 New Member

    alright thanks man so where is the sensor located. sorry for not knowing much but im not that mechanically inclined but i will be learning this fall.
     
  21. rwenzing

    rwenzing Bob

    Look near the outlet of the exhaust manifold or nearby in the exhaust pipe connected to the exhaust manifold. There will be a 4-wire sensor screwed into one or the other.
     

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