Hey Scotty I have an 05 Honda Accord DX with 2.4L 4 cylinder engine with straight drive transmission. My check engine light came on I used my diagnostic tool and found code p0420 catalyst system efficiency below threshold. My first thought was catalytic converter, but when idling at operating temperature I noticed my first O2 sensor is showing no voltage while the second one is show the normal.5 volts, but when I pull it out of the car and use a propane torch and voltage meter it appears to be making the .5 volts. Have you ever run into this before and we’re would you start.
found code p0420 catalyst system efficiency below threshold
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when I pull it out of the car and use a propane torch and voltage meter it appears to be making the .5 volts.
maybe there's damage/corrosion on the wiring harness/connectors, etc.
