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VSC OFF and P0420 Issue

Discussion in '4th Gen 4Runners (2003-2009)' started by Creed1717, Oct 10, 2018.

  1. Oct 10, 2018 at 7:04 PM

    Creed1717 [OP] New Member

    Oct 10, 2018
    I recently purchased a 04' 4runner with 111k miles. The 4runner has an aftermarket spotlight and I had turned them on and I noticed a check engine light + VSC off light appear. So I return home and run my OBD2 scanner. I get the P0420 error which is a catalytic/O2 sensor failure. So I cleared the codes and the VSC light turned off along with the check engine light. Now I am going to replace my Bank 1 O2 sensor, but I'm still confused. Could my spotlight have caused the O2 sensor to stop working and disable my VSC?

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