Opened the air filter box and saw signs of oil in the filter, there was also small signs near the turbo and up in the hose clips which are broken but modified by the mechanic do to the job! Last two regular services were done: 10 months ago (air filter was clean back then), and last service was done 5 months ago. It is typically set on late model Ford vehicles. Some issues that may cause the code to appear include a defective crankcase pressure sensor, electrical issues, and a defective PCV valve. Symptoms to look out for include poor fuel economy, gasket leaks, and an illuminated check engine light. Hello everyone I recently bought a 2012 Focus 1.0 ecoboost form a private seller and only after two weeks I was driving normally and the car went into Limp mode and started misfiring the I noticed that Autostart stop light was always off until this issue happend and it turned on but it still doesn't work, I took it to a mechanic and he said E84boL.