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1992 tbi 350, 2wd, check engine coming on

Old Nov 17, 2022 | 06:18 PM
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Default 1992 tbi 350, 2wd, check engine coming on

put on new o2 sensor, new catalytic converter, and 500 miles later the 'service engine soon' light comes on.... and when I check it with the paper clip it blinks a 12. What and why?
 
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