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Engine light still on after changing O2 sensors on 1999 Ford Explorer

Tiny
CINISIN
  • MEMBER
  • 1999 FORD EXPLORER
  • 145,000 MILES
Have changed both bank one o2 sensors and the engine light is still on. What else can it be or what else do we need to check or test?
Monday, October 17th, 2011 AT 4:01 PM

13 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you check for codes? What was the actual code? The code doesn't tell you what to replace just that the system thinks there is a problem on that circuit, somewhere.
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Monday, October 17th, 2011 AT 4:05 PM
Tiny
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  • MEMBER
  • 7 POSTS
It comes up code P0135.
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Monday, October 17th, 2011 AT 4:07 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Any driveability issues? Did you check the 02 heater circuit?
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Monday, October 17th, 2011 AT 4:20 PM
Tiny
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  • MEMBER
  • 7 POSTS
Is the 02 heater circuit a different part than the o2 sensor? We have changed o2 sensors on bank 1 and 2. Sensor one. It only has one sensor 2 on bank 2.
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Monday, October 17th, 2011 AT 4:30 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
The heater circuit is part of the sensor. I'm talking about the electrical circuit. What's the litre size of engine?
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Monday, October 17th, 2011 AT 4:42 PM
Tiny
CINISIN
  • MEMBER
  • 7 POSTS
4.0 and Vin code is x
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Monday, October 17th, 2011 AT 4:48 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
At the 02 sensor connector, lite blue wire with orange tracer is voltage, with the key on, any voltage? If not, that circuit is fuse protected.
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Monday, October 17th, 2011 AT 5:05 PM
Tiny
CINISIN
  • MEMBER
  • 7 POSTS
Will check that this evening. Will let ya know. Thanks so much!
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Monday, October 17th, 2011 AT 5:24 PM
Tiny
JDL
  • MECHANIC
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Like I said, check for voltage.
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Monday, October 17th, 2011 AT 6:12 PM
Tiny
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  • 7 POSTS
Thank you! I will check tonight.
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Monday, October 17th, 2011 AT 6:14 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Let us know what you find.
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Monday, October 17th, 2011 AT 6:27 PM
Tiny
CINISIN
  • MEMBER
  • 7 POSTS
Last night we changed a 15 amp fuse in the engine compartment and then cleared the code. So far the engine light has not come back on.
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Tuesday, October 18th, 2011 AT 2:55 PM
Tiny
JDL
  • MECHANIC
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Sounds like you got going your way, good job.
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Tuesday, October 18th, 2011 AT 3:24 PM

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