P0171 2003 Toyota Corolla -

Question

What is wrong to get codes P0171 & P0420 on 2003 Toyota Corolla & How much should it cost to repair?

Answer 1

depends what is exact problem is, I suggest you get it checked out

P0171 might be an intake leak, dirty mass air flow sensor, bad oxygen sensor

P0420 might be related to the P0171 so fix that code first. if the codes comes back without p0171 there might be an exhaust leak or the catalytic converter is bad