O2 sensor troubles
04-10-2007, 11:12 AM
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O2 sensor troubles
Hey all, I have a '96 f-150 with a 5.0L 302 auto 4X4 with about 100k on it. I am currently having alot of trouble with the O2 sensors. A while back the check engine light came on so took the truck to one of my buddies to read the codes. According to him It was throwing codes for 2 of O2 sensors and the heaters that go with the O2 sensors. So i promptly replaced the 2 O2 sensors that were throwing the codes and disconnected the battery to reset the engine light. Then started it up and took it for a drive. The check engine light stayed off for a couple miles then came back on after pulling out from a stop sign. I then took it back to my buddy to check and see what codes were coming up and this time the only codes coming up were for the same 2 heaters for the O2 sensors that i had already replaced.
The truck seems to be running fine and im getting the same gas mileage i was getting before having the sensor problems. Im thinking its a short somewhere in the heater circuit but have no idea where to start looking. If anyone has any ideas i could really use the help. thanks
The truck seems to be running fine and im getting the same gas mileage i was getting before having the sensor problems. Im thinking its a short somewhere in the heater circuit but have no idea where to start looking. If anyone has any ideas i could really use the help. thanks
04-10-2007, 12:39 PM
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What exactly are the codes. Usually if its bad cats the code will read Insufficent Catalyst bank 1 or 2. Check the fuses and wiring for the O2 sensors. Did you install direct plug in o2s or universal wire in O2s? Let me know.
04-10-2007, 12:45 PM
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They were direct plug in o2s. Also i dont have a whole lot of time to work on it right now do you think it will hurt to keep driving it for a couple weeks till i find some time to work on it?
Oh and i also dont remember exactly what the codes were anymore (being it was a week or two ago already) though im pretty sure it didnt say Insufficent Catalyst bank 1 or 2.
Oh and i also dont remember exactly what the codes were anymore (being it was a week or two ago already) though im pretty sure it didnt say Insufficent Catalyst bank 1 or 2.
Last edited by NAK2905; 04-10-2007 at 12:48 PM.
04-12-2007, 09:49 AM
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Alright, i checked the fuses and the wiring and couldn't find anything wrong(worn wires, bad connections, ext.). Does anyone have any other ideas? I plan on checking the codes again as soon as i can get my hands on a scanner but might be a little while till i can. Also another update im starting to notice an unusual smell from the exhaust. Im assuming this is from a bad fuel mixture but i could be wrong. thanks for the help so far.
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04-12-2007, 08:30 PM
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I can't tell you exactly what is wrong but I can tell you just because you get codes on your O2 sensors, that doesn't mean the sensors are bad. It could just mean that they are reading a bad mixture of air and such and the info it sends to the computer cannot compensate for it. I had engine codes for bank 1 and bank 2 O2 sensors, but it was caused by a vacuum leak. Unfortunately, vacuum leaks can be murder to find.
Jim.
Jim.
