This highlander came in with P0174 code.

During idle: Long term FT Bank 1: -5% to +5% Long term FT Bank 2: +40% up Short term FT Bank 1: -3% to +3% Short term FT Bank 2: around +20%

Replaced sparks plugs and found out Bank 2 side plugs have carbon deposit, ...

FIX posted 3/18/2017

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