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Engine off turn key forward until lights go on. On the firewall in the corner by the driver is a blinker box. carefully remove the top press the button and hold for 5 seconds the light should come on. release and repeat .the light should go off. the codes are erased now. To check start car or put the pigtail into hole two. press button for three seconds and release. the red light will blink the code 111 is no codes.

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Q: How do you reset the check engine light on a 1989 Volvo 740 GL?
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