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Old 01-29-2012, 05:21 PM   #1
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O2 Sensor

My truck is throwing a code for O2 Sensor. Its a 06 V6 with 65K miles. How do I know which O2 sensor to replace? Thanks
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Old 01-29-2012, 05:22 PM   #2
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The code should tell you what sensor is going bad.
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Old 01-29-2012, 05:25 PM   #3
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The code is P0430
Catalyst system efficiency below threshold
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Old 01-29-2012, 05:27 PM   #4
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Ok sound like you may have a bad cat or cats not a bad O2 sensor.
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Old 01-29-2012, 05:31 PM   #5
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Quote:
Originally Posted by whippersnapper02 View Post
Ok sound like you may have a bad cat or cats not a bad O2 sensor.
Yea if I reset the code it will stay off for the next few drives. I hope its not the cats they are $$$ but at least in Florida their is no smog test
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Old 01-29-2012, 05:32 PM   #6
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Quote:
Originally Posted by 4x4jeep View Post
Yea if I reset the code it will stay off for the next few drives. I hope its not the cats they are $$$ but at least in Florida their is no smog test
You probably have bad cats.
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Old 01-29-2012, 07:01 PM   #7
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Is their a way to test the O2 sensors?
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Old 01-29-2012, 07:35 PM   #8
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its the passenger side downstream. P0430 is bank 2. Bank 2 = cylinder 2 side

check for leaks before downstream 02 sensor. then if no leaks replace 02 sensor. then replace Air /fuel ( upstream sensor). if MIL doesnt go away, bad cat. also if there is bad (rotten egg smell from exhaust) smell from exhaust, its the cat. the only cat u have to worry about if there is no smog test is the manifold cat. 500$ for magnaflow direct fit manifold cat and 300-400$ for eastern direct fit manifold cat. Homework has been done.
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Old 01-29-2012, 07:37 PM   #9
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Quote:
Originally Posted by 4x4jeep View Post
Is their a way to test the O2 sensors?
Ometer test. test the electric waveforms based on factory service manual. Buy Ometer at wally world
..

Oh and cats just dont magically go bad. Mecs say that to get more $ outta you. fixed my stuff 3 weeks ago with 02 sensrs, mecs said it was BOTH cats. so....
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Old 01-29-2012, 07:38 PM   #10
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Thanks exhaust smells normal. Ill check for leaks in the A.M. and replace sensors accordingly
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