V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

O2 sensor related problem/question

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Old Sep 3, 2012 | 06:32 PM
  #1  
ih8unow's Avatar
ih8unow
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From: alabama
Default O2 sensor related problem/question

On the last tank of gas that I went through my mileage was down about 40% and right before I filled up my engine light came on. The code was reading P0136 which I thought was the rear sensor and was mainly for emissions control purposes. I decided to go ahead and change the front and rear sensors out on the driver's side and reset the light. Needless to say at around half a tank my mileage was still really low and the engine light came back on.

Any thoughts or suggestions? It is a 1999 3.8 v6. I will also add that my only engine mod is a cai and I just changed the fuel filter at my last oil change around 1,000 miles ago.

Last edited by ih8unow; Sep 3, 2012 at 06:38 PM.
Old Sep 4, 2012 | 01:50 AM
  #2  
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From: losangels
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Old Sep 4, 2012 | 06:53 AM
  #3  
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BabyGT
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What the deuce??
Old Sep 6, 2012 | 12:31 AM
  #4  
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Wow. Spammed by diablo bots
Old Oct 17, 2012 | 04:21 PM
  #5  
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Juan Lopez
 
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Originally Posted by Dubwhat
Wow. Spammed by diablo bots
Funny, because there are more bots playing Diablo 3 at this time than there are players! (What a 10 years in the making letdown)
Old Nov 5, 2012 | 02:41 AM
  #6  
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petrock
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Originally Posted by ih8unow
I thought was the rear sensor and was mainly for emissions control purposes.
While not entirely incorrect, the rear sensor does have an effect on fuel trim.


Originally Posted by ih8unow
I decided to go ahead and change the front and rear sensors out on the driver's side and reset the light. Needless to say at around half a tank my mileage was still really low and the engine light came back on.
I assume the code was the same, in which case the problem is a wiring issue or an exhaust leak up stream of the sensor. Since its a low voltage issue, if it was a wiring issue either a wire is broken or the signal wire to the sensor is shorted to ground before it gets to the computer.

Good luck...
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