P1131 2002 Ford F150 -

Question

truck wont start sometimes,,,,,,,,let it set an then starts

Answer 1

Hi there,

The code P1131 indicates an issue with the upstream oxygen sensor on bank 1. Here is a list of possible causes.

P1131 FORD - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

Read more: https://www.autocodes.com/p1131_ford.html

The code P0171 indicates an issue with the fuel injection system on bank 1. Here is a list of possible causes.

P0171 FORD - Fuel Injection System Too Lean Bank 1

Read more: https://www.autocodes.com/p0171_ford.html