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Old 11-26-2013, 12:41 AM   #4 (permalink)
Ryland
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honda cb125 - '74 Honda CB 125 S1
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It's rare for the o2 sensor to throw a check engine light code, unplugging the o2 sensor is the most common way to test it as most people feel a stumbling with a failed o2 sensor.
Bad exhaust or over sized exhaust is the most common caused of a dead o2 sensor.
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