Question

2003 Ford Expedition V8 5.4L with codes C1285 and C1287. How do I fix it?

Answer 1

Both codes, C1285 and C1287 indicate an issue with the Brake Booster, You must replace the Brake Booster to repair the problem. Here are the links to the codes pages for more information.

C1287 Ford Code - Booster Pedal Force Switch Circuit Failure
Read more: https://www.autocodes.com/c1287_ford.html

C1285 Ford Code - Booster Solenoid Circuit Failure
Read more: https://www.autocodes.com/c1285_ford.html