Check Engine Light

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  #1  
Old 07-25-05, 09:19 AM
dgabriel's Avatar
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Check Engine Light

Ford Explorer XLS 1999, V6 4.0L 160hp, 46,600 miles.

Check engine light went on. Code read at autozone indicated downstream O2 sensor. I bought the sensor (Bosch). Did not get around to installing it, the light went out. 500 miles later the light went on again. I have not read the code again. 100 miles later, the light went off.

Is this behavior typical? Is the the original code diagnosis valid?
 
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Old 07-25-05, 09:54 AM
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Originally Posted by dgabriel
Is this behavior typical?
Not unusual for a stored trouble code that won't immediately effect the running of the engine
Originally Posted by dgabriel
Is the the original code diagnosis valid?
That depends on what the original code actually was

AutoZone is pretty famous for stuff like reading an "o2 sensor indicates lean" code and selling an o2 sensor to correct the problem (fyi-that's just replacing the messenger, not addressing the problem)

Do you remember the actual code?
 
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Old 07-25-05, 02:46 PM
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The Code was 136
 
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Old 07-26-05, 05:09 AM
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That code does indicate a problem with the o2 circut
If you already have the part, and 46K on the truck, I'd go ahead and replace it
It's a little early, but it'll only help to get a fresh one in there

You'll want the codes reset (need a scan tool to do it-I'm guessing A/Z will do that for you)
Once reset, see if it pops back
 
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