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What typically causes high CO readings on a 91 Honda prelude SI?
Wiki User
∙ 14y ago
High HC is unburnt fuel. Check the O2 sensors, Plugs, wires,cap ,rotor, timing. If it failed CO & Nox also check the converter. Possible that it may not have been properly warmed up before testing.
I would recommend looking at the o2 sensor (you only have one on your car) and the coolant temp sensor.
Wiki User
∙ 14y ago
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