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I recently had a hole welded up on my 2005 LS430. The hole was in the Y connector near the gearbox.

I am now getting the VSC light coming on after a short distance.

OBD reader says Catalyst system efficiency below threshold bank 1.

Which side is bank 1, is it the drivers side?

Any ideas?





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Hi Scott

Bank 1 is passenger side

hope this helps

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