Engine light still on after changing O2 sensors on 1999 Ford Explorer
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?
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Monday, October 17th, 2011 AT 4:01 PM
13 Replies
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
CINISIN
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It comes up code P0135.
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Monday, October 17th, 2011 AT 4:07 PM
JDL
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Any driveability issues? Did you check the 02 heater circuit?
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Monday, October 17th, 2011 AT 4:20 PM
CINISIN
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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
JDL
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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
CINISIN
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4.0 and Vin code is x
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Monday, October 17th, 2011 AT 4:48 PM
JDL
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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
CINISIN
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Will check that this evening. Will let ya know. Thanks so much!
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Monday, October 17th, 2011 AT 5:24 PM
JDL
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Like I said, check for voltage.
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Monday, October 17th, 2011 AT 6:12 PM
CINISIN
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Thank you! I will check tonight.
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Monday, October 17th, 2011 AT 6:14 PM
JDL
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Let us know what you find.
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Monday, October 17th, 2011 AT 6:27 PM
CINISIN
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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.