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Those years of Corolla did not have an OBDII port, my 1989 (which is just about the same as the 1991) does have a "DIAGNOSTIC" connection under the hood attached to the driver side strut tower. You take a jumper (like a paperclip) and connect it to two of the connections (I think T1 and E, but look it up to make sure) and then you count the number of times the check engine light flashes. I believe the owner's manual has a section on it even, or lots of web pages mention it. Then look up the "codes" and see what it's complaining about.

Cost should be just about zero.

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Q: What is the cost to scan the ecm computer for a 1991 Toyota corolla?
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