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The Importance of O2 and A/F Testing
Catalytic converter and flex-fuel problems can be tricky to diagnose. Inaccurate data from an oxygen sensor or air/fuel sensor can lead a tech down the wrong path and cause needless replacement of good parts. When dealing with catalytic converter fault code(s) and flex-fuel problems, it is necessary to make sure that the air/fuel (A/F) and/or oxygen sensors (O2S) are accurately reporting.
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