You can read the codes with a paper clip on an 89.
Ground out the last tow on the aldl connector under dash and turn key to ON. The check engine light will flash code 12 one flash, then two flashes///
three times then give any other 2 digit codes stored.
You can clear any old codes by removing a battery cable for 10 seconds.
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Sunday, November 25th, 2007 AT 4:13 AM