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89 would be non-OBD. The only way to check the codes is to pull up the front of the passenger's carpet and look at the ECU when the key is on. There is a window in it, with an LED that will blink out the codes. No long/short blinks, just count the number of blinks until it pauses.
Generally the codes are only blinked out if the check-engine light (CEL) is on.
-soD
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