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Old 09-14-2007, 21:15   #1 (permalink)
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All 4 O2 Sensors Bad?

I recently took my 98' taurus (3.0) to have the codes pulled (due to a service engine soon light). The codes said that all 4 of my oxygen sensors are bad.

The light has only been on for 2 weeks and about 1 week ago, the light went out for one day. This seems a little odd, to have all 4 go out at exactly the same time. Is this an electrical problem, or is it actually the sensors? Any advice? Thanks.
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Old 09-15-2007, 07:13   #2 (permalink)
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Question Re: All 4 O2 Sensors Bad?

Quote:
Originally Posted by pooperscooper
I recently took my 98' taurus (3.0) to have the codes pulled (due to a service engine soon light). The codes said that all 4 of my oxygen sensors are bad.

The light has only been on for 2 weeks and about 1 week ago, the light went out for one day. This seems a little odd, to have all 4 go out at exactly the same time. Is this an electrical problem, or is it actually the sensors? Any advice? Thanks.
What were the exact codes???
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Old 09-15-2007, 10:21   #3 (permalink)
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Re: All 4 O2 Sensors Bad?

I agree. There is either a wiring problem or a PCM problem.

If you can trace the wires down on the PCM connector you can back probe the connector and see what the O2s are sending back with a voltmeter. They should oscillate between ~.3 to ~.7 volts.
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Old 09-15-2007, 13:05   #4 (permalink)
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Re: All 4 O2 Sensors Bad?

Thanks SHOZ123. I was going to do the backprobing, but I didn't now what the parameters were. That will help.
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Old 09-15-2007, 13:57   #5 (permalink)
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Re: All 4 O2 Sensors Bad?

You should not see 0volts or higher than 1.5V
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Old 09-21-2007, 13:15   #6 (permalink)
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Re: All 4 O2 Sensors Bad?

Follow UP:

After debating on diagnosing my electrical issues, I realized that a professional would be better suited for the job. I found a guy in Fremont, CA that charged $80. His report found that it's actually a problem with the PCM. He's saying that, although the 02 sensors and heaters are good, the heaters aren't getting the proper signal. He then quoted me $650 to replace it.

I have searched ebay for used pcm's and they seem to be going for about $50. Does anyone know how difficult it is to replace? It seems to be lodged inside the firewall, but I don't want to just rip it out without any input from people with experience. Thanks.
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Old 09-21-2007, 17:56   #7 (permalink)
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Re: All 4 O2 Sensors Bad?

Rather than go used, contact one of these places and have them rebuild yours. It will cost a bit more, but will have a warranty.

www.ecudirect.com
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