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Old 10-24-2012, 07:49 PM   #7 (permalink)
Chuck33079
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I'm not sure if the Z's ecu works the same way, but on other cars I've been able to see pending codes on an OBD scanner even if the check engine light isn't on. Might be worth a shot before you spend eternity troubleshooting. Or, clear the ecu and assume it's a random one-off glitch unless it comes back. If it's a real issue, it'll happen again.
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