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    blgrass's Avatar
    blgrass Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 28, 2012, 12:15 AM
    How do you know which sensor is bad on 98 civic ex
    Forgot code #,but they said it was on the exhaust,but not exactly know which one
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Jan 28, 2012, 05:32 AM
    It will be either the upstream or the downstream oxygen sensor. The upstream is on the exhaust manifold, while the downstream is on the catalytic converter.
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