1999 Dodge Caravan Computer Cannot Communicate with O2 Sens

1999 DODGE CARAVAN
115,000 MILES • 6 CYL • 2WD • AUTOMATIC
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AVRICK
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  • 2 POSTS
Originally computer showed car needing 2 O2 sensors. Mechanic replaced the right sensor without problem. The left O2 sensor will not communicate with the computer.

The mechanic was unable to figure out the resolution to this issue. I have 10 days extension on my inspection.

Any recommendations on how to proceed with getting this resolved?

Thanks.
Jul 23, 2008 at 1:32 AM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
Have the wiring checked between O2 and PCM. Also check to see if O2 is produceing a signal voltage.
Jul 23, 2008 at 2:17 AM
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AVRICK
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[quote:5030133448="Docfixit"]Have the wiring checked between O2 and PCM. Also check to see if O2 is produceing a signal voltage.[/quote:5030133448]


Do you know if this wire path passes through the harness that is located beneath the left front fender?
The car was recently in a crash that severed these wires and the harness was replaced. Could it be one of these wires?
Thanks.
Jul 24, 2008 at 1:18 AM
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DOCFIXIT
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Not sure of the exact path but that would be th place to start. If the harness was not replaced but repaired that will cause too much resistance in the circuit thus giving non com error.
Jul 24, 2008 at 8:59 AM
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AVRICK
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[quote:be0baaf7b0="Docfixit"]Not sure of the exact path but that would be th place to start. If the harness was not replaced but repaired that will cause too much resistance in the circuit thus giving non com error.[/quote:be0baaf7b0]

I am now being told that the computer needs to be replaced. Is this likely? If the computer was bad, wouldn't other issues be present?

What is the cost of a computer for a 1999 Dodge Caravan?
Jul 29, 2008 at 6:51 AM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
It is a possiblilty . If all circuits checked out then the PCM failure is the likely conclusion.
Was the van repaired ? Or just the harness ?
I think your PCM is located on the left check out location. Maybe be wreck related.
Jul 29, 2008 at 7:43 AM
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