1993 Chevy Blazer engine codes

1993 CHEVROLET BLAZER
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CHUCK77
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Electrical problem
1993 Chevy Blazer 6 cyl Four Wheel Drive Automatic

93 chevy s-10 blzer tahoe, i don't have a repair manuel for it,and none of the parts stores can find the codes that far back.all they have is obd2.my codes are 21 22 23.if you could help it would be appreciated.by the way it's 4 wheel drive with 4.6 liter engine.
Mar 5, 2009 at 2:17 PM
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JDL
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Hello, is the vehicle running ok? Any driveability issues? The generic chevy blazer info shows this.


https://images.2carpros.com/forum/automotive_pictures/170934_93_chevy_blazer_1.jpg

If you have done a lot of modifications???
Mar 5, 2009 at 2:51 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.