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Which oxygen sensor should you change on your 1999 Chevy blazer back firing problems?

Anonymous

∙ 11y ago

Updated: 8/21/2019

If it had a bad O2 sensor the "check engine" would be illuminated and a code would be set indicating which sensor is at fault. You probably have other problems causing that backfire to occur.

Wiki User

∙ 11y ago

What else can I help you with?

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