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View Full Version : How do you know which sensor is bad on 98 civic ex


blgrass
Jan 28, 2012, 12:15 AM
Forgot code #,but they said it was on the exhaust,but not exactly know which one

TxGreaseMonkey
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.