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I am working on a 2004 Ford Explorer 4.0l have replaced O2 sensors and was attempting to get the vehicle ready for state inspection preformed the drive cycle and after drive cycle completed I am still getting 4 incompletes from the computer.

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Some times it takes several days to reset the drive-cycle = Starting from cold state, different speeds for a certian distance, EVAP from cold condition and time. If the PCM dosen't get the proper readings from the sensors it won't reset untill it does. If you keep getting an " incomplete" on a system, then there's a problem with that system and you will have to find and repair it.
Give it a few days of running varried trips.

Posted on Mar 16, 2011

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I have a 2004 ford explorer xlt v6 4.0l gas. need a o2 sensor diagram. I need names and description. for example bank 1 sensor 2 after catalytic converter


https://www.google.com/search?q=1998+BMW+318i+Automatic+Torque+settings+Head+gasket&biw=1360&bih=650&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwie8o3ix8_QAhUJRSYKHdIXBrkQsAQIKQ#tbm=isch&q=2004+ford+explorer+xlt+v6+engine+firing+order

Hope this helps

Bank two are the even cylinders. Follow exhaust manifold on the side. You will find an O2 sensor just after or on the manifold, before the catalytic converter. Then, look after the catalytic and you should find another O2 sensor, this is the one you mention in your post.

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How do I pass vehicle inspection O2 Cat. Evap for a 2004 Chevrolet Cavelier


What was the code given..
02 will mostly sensors..
Cat code 420 will need new cat
And evap codes can b a couple different parts..need exact codes to tell what all is needed for fix

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Need the correct number and or location for the PCM fuses and the heated O2 sensors,EGR Vaccum regulator, EVR solenoid, camshaft positionsensor fuses on a2003 focus in the interior and exterior fuse b


To start with, if the check engine light is not on, you probably don't need to check any of the components.
The engine and systems have to get up to operating temp and go thru the closed loop program a few times before the exhaust can be checked.
The printout you have says the engine and exhaust have not been hot enough yet.
The correct process to make the components ready to test is - drive at 55 mph for at least 12 min with no stops or variance in speed. Then 0-35 mph at least 4 times, and make sure you make complete stops each time. This should run the emissions system thru a complete drive cycle.
Some state testing is different so check with your state.

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1 Answer

I had all 4 o2 sensors replaced 3 years ago and now my explorer is sending the o2 failure code again. What could be the cause of the failure/code? thanks, scott


Before i can give you an O2 sensor code I need to find out what kid of vehicle you have and as for the sensor problem you can look to see if one of the O2 sensors are unplug.

Good Luck!

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1 Answer

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I would assume you have never looked under your vehicle, or have no knowledge of O2 Sensors

They are always in the exhaust pipes, either just before the converter or in the converter.
The second one, is almost always in the converter, at the outlet.

Some vehicles have two,some four.

You can always follow the wires to them

Replace with the exact part,some sensors are universal, and require cutting wires,splicing etc. Forget them.

O2 Sensor Codes----you may get,DO NOT tell you they are bad or what to replace.
Just that a sensor is out of range. Always test first. Don't throw parts at it.

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1 Answer

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Check engine light on.


Replace O2 sensor. They have to be really hot in order to read right. Did you ensure to drive around a good 30 min to make it hot?

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