hi sequoia fans. i own the subject toyota which is maintained well. i ran into a yellow light today and seeking some information and guidence.
i was driving earlier in the day in 4x4 for few miles in messy snow road and it was no issues.
i then had 4x4 off and drove fine and then after a few miles, the check engine + VSC off + VSC TRAC ( all 3 ) lights came on.
as far as driving was concerned, drove fine no issues that i could feel diff in performance.
i did some research and found everything from gas tank cap, yaw sensor and 0 possible calibration issue?
i checked gas cap and appears tight and closed well. last work was oil change performed 8 weeks back.
i checked with scan tool which gave me a P0420/P0430, two codes with info,
"Catalyst System Efficiency Below Threshold Bank 1" + "Catalyst System Efficiency Below Threshold Bank 2"
i followed some steps, to clear the code, and it went away, and put vehicle in N, turned off and on and two VSC lights went off.
two weeks later, the same set of lights are back on. where do i start?
i was driving earlier in the day in 4x4 for few miles in messy snow road and it was no issues.
i then had 4x4 off and drove fine and then after a few miles, the check engine + VSC off + VSC TRAC ( all 3 ) lights came on.
as far as driving was concerned, drove fine no issues that i could feel diff in performance.
i did some research and found everything from gas tank cap, yaw sensor and 0 possible calibration issue?
i checked gas cap and appears tight and closed well. last work was oil change performed 8 weeks back.
i checked with scan tool which gave me a P0420/P0430, two codes with info,
"Catalyst System Efficiency Below Threshold Bank 1" + "Catalyst System Efficiency Below Threshold Bank 2"
i followed some steps, to clear the code, and it went away, and put vehicle in N, turned off and on and two VSC lights went off.
two weeks later, the same set of lights are back on. where do i start?
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