OishiiJPN

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Please see T-TT-0698-22 (link needed)

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CONDITION:
Some 17-22MY Highlander and 17-20MY Sienna vehicles may experience a MIL ON condition with DTC(s) P042000, and/or P043000. This issue could involve deteriorated catalyst material from the bank 1 or bank 2 catalytic converter. Please see table below for affected vehicles.

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DTC(s) related to this condition:
P042000 – Catalyst system efficiency below threshold bank 1
P043000 – Catalyst system efficiency below threshold bank 2

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RECOMMENDATIONS:
If this condition is identified, please take detailed pictures of the untouched catalyst as well as any debris or abnormal materials suspected to have caused the catalyst substrate to deteriorate. Please create a TAS case providing this information and contact TAS for further instructions. If it is a weekend or a holiday, continue with diagnosis and repair and contact TAS on the next available business day. Please hold all parts for recovery to help with further investigation including all foreign objects found inside the exhaust manifold.
 

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