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Error Code P1158

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I'm new to the board and hoping someone on here can help me.

2007 RX350 with just over 100K on the odometer.

Just had the VSC and Check Engine light come on.

Checked with my OBDII scanner and came up with error code P1158. Searched all over the net and can't find anything relating to Lexus. Found a couple of threads concerning this code with respect to BMW (P1158 - Fuel Trim Adaptation Additive Low (Bank 1). So possible vacuum leak?

Any help on this issue would be greatly appreciated.

Also, when should I change the spark plugs?

Thank you.

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