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where do I start the codes are p0171 p0174 and p0300

Vehicle: 2002 lexus es300 v6

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Hi there,

The codes P0171 and P0174 indicate the air/fuel mix is too lean on bank 1 and 2. Here is a list of possible causes.

P0171 LEXUS - Air/Fuel Mixture System Lean Bank 1

Read more: https://www.autocodes.com/p0171_lexus.html

P0300 indicates a misfire on random cylinders. Here is a list of possible causes.

P0300 LEXUS - Random Cylinder Misfire Condition

Read more: https://www.autocodes.com/p0300_lexus.html

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