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(1990 Ford F-150)
in Mount Joy, PA on January 09, 2010
My engine light came on and I took the truck to the garage,and they put an oxygen sensor in.The light went off and came back on, about one hour later.It has done this 3 times now.An oxygen sensor was put in each time.The light still comes back on saying oxygen sensor.What could be the problem?
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Popular Answer
on April 23, 2010
I had an oxygen sensor issue that caused the check engine light to come on repeatedly. It would stay on intermittently. Also, when I got the vehicle inspected they told me that the dashboard indicator light for my parking brake was out.
I bought an oxygen sensor to replace (Bank2 sensor1) which was shown on the computer.
I solved all of my problems by simply jiggling the old O2 sensor wire a little. I guess it was loose. Didn't even need a sensor.
Not only did check engine light go off, the parking brake light now works as well.
Go to your local auto parts store and ask where the O2 sensor is, then check that it is not loose. I have still had no trouble with it 6 months later.
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on May 02, 2010
unhook your native battery cable and wait a few minutes and replace battery cable this will erase all trouble codes the computer may have in memory. You may not have a problem.
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Are they fitting an Original Equipment type sensor or a one size fits all sensor. Sometimes aftermarket sensors they you have to cut and solder wires on to get them to work end up costing you time and money in the end. I always use direct fit sensors.
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Being OEM sensors you wouldn't be expecting a problem. Is the sensor contaminated in any way. I just took one out of a Ford you could see the tip was green from antifreeze deposits. Do the sensor patterns just not cross count or change voltage range when driven full rich to full lean? You shouldn't have to change ythe sensors as frequently as you have been.
Later (OBD2 compliant cars) have a heater circuit built into the Oxygen sensor to keep them at optimum operating temperature and achieve that temperature form cold start up, it would be conceivable that they could "burn out" if the computer kept the heater alive for too long but I have never seen it happen. I would be interested to find out what "fixes" your problem.
on January 10, 2010
These are OEM sensors. They did not have to modify the wiring.
on January 10, 2010
The oxygen sensors were clean at the tip.I have an antifreeze leak outside the engine somewhere on the passenger side though.The engine light only comes on after I drive it for 1/2-1 hr.It doesn't make any difference in the power.Iam also getting good gas mileage.My email address is
on July 02, 2010
I am having a similar problem, but am not sure which sensor needs replacement, either the front or rear. are they any different ? or is it the same sensor just in different position?
on September 11, 2010
Repeated failure of supply side 02 sensors is usually caused by a bad vapor recovery system canister, or it's purge valve. Neither part is expensive, but unfortunately it is not instrumented to produce a code, so you have to go through this process which is expensive.

The same problem often also produces errant 'Tighten Gas Cap' codes, did you also have that issue?
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