where do i start codes are p0171 p0174 and p0300

Question

where do I start the codes are p0171 p0174 and p0300

Answer 1

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