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Q:

I have a chick engine light come up and the vsc track light,catlystic converter on 2003 Toyota 4Runner

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Bank 1 was the code displayed when diagnose
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PO420 CODE?
Yes. Actually this problem started when I change the plugs and one of the plug head had a crack and there was a misfiring when I was on the high way
Need a scan test to view live data and pull any codes present.
I did and came up with code 101tresh hole bank 1