P0171 Lexus -

Question

Need help. I got code p0171. Replace front o2 sensor and also clean the MAF sensor. I am still having check engine light. Also does that code cause my brakes to not want to brake? When brake is apply, the pedal gets hard and brakes slowly.

Answer 1

Hi there,

You have a vacuum leak. This is causing the lean code and the leak may be the power brake booster or the vacuum line to it. When the booster loses vacuum the brake pedal will become very hard.