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how to check ? 200 1989

posted by  someone claiming to be stripping90 on  Wed Oct 8 16:50 CST 2008 [RELATED]

Can anyone help with the how to on checking the preheater/wiring for the o-2 sensor?I think that I either have a direct short or that the voltage is missing because I keep tripping the CEL and both the 0-2 and the MAF are working fine.
I found myself temporarily without a manual or diagram.
as always,thanks so much for the help






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