Oxygen sensors?
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Junior Member
Joined: Aug 2004
Posts: 1
Likes: 0
From: texas
Oxygen sensors?
My check engine light came on and my truck will not idle when you come to a stop and you let off the gas it will die. So I took it Auto Zone and them check it.
They told me it was my Oxygen sensors and I needed to replace them so
I purchased the two front sensors like they said. I replaced them and reset the computer but it did not seem to make any difference. The next day my check engine light came on again. So I took it back to Auto Zone the next day and them check it again . They said it was the front side oxygen sensors again that I need to bring them back and get new ones. So I uninstalled them and took them back and got new ones and installed them. The next day my truck ran about 20 min. and then the check engine light came back on. So I took it back to Auto Zone and guess what, the code said it was the oxygen sensors again and I need to replace again. I told them this was the second pair in three days could it be something else. They said they did not know. I can't believe these sensors are going out. Has to be something else wrong? any help would be greatly appreciated.
Thanks,
They told me it was my Oxygen sensors and I needed to replace them so
I purchased the two front sensors like they said. I replaced them and reset the computer but it did not seem to make any difference. The next day my check engine light came on again. So I took it back to Auto Zone the next day and them check it again . They said it was the front side oxygen sensors again that I need to bring them back and get new ones. So I uninstalled them and took them back and got new ones and installed them. The next day my truck ran about 20 min. and then the check engine light came back on. So I took it back to Auto Zone and guess what, the code said it was the oxygen sensors again and I need to replace again. I told them this was the second pair in three days could it be something else. They said they did not know. I can't believe these sensors are going out. Has to be something else wrong? any help would be greatly appreciated.
Thanks,
Senior Member
Joined: Jan 2003
Posts: 150
Likes: 1
I am going to take a wild stab in the dark... Rotton PCV elbow on the back of the trottle body.
Follow the PCV tube to the back of the throttle body and with the engine running you will find a Vac leak.
When mine rotted on my 97 5.4 , I had the same symptoms,, stalling engine,, O2 sensor codes, and also a Mass air code.
Good luck and I hope this is it,,, super easy fix and a 20 dollar part from Ford
Follow the PCV tube to the back of the throttle body and with the engine running you will find a Vac leak.
When mine rotted on my 97 5.4 , I had the same symptoms,, stalling engine,, O2 sensor codes, and also a Mass air code.
Good luck and I hope this is it,,, super easy fix and a 20 dollar part from Ford
Senior Member
Joined: Jul 2004
Posts: 3,105
Likes: 4
From: oceanside C.A.
i kept havine my check engine light coming on in my 96 jeep, the code kept coming up that it was the o2 sensor replaced it and the code would come back in a day, replaced it again same thing, so i checked the wires from the sensor conection on back sure enough the wires that are close to the exaust manafold had dry rotted and were touching and sending the code fixed the wires havent had a problem since, it is something you should check out.