Hello, I just bought beautiful ford mondeo, really happy about the most of the things, but one issue shows up...
And I need your help to solve it 🙂
For example I fill it up 20liters it shows that I am able to run 230 miles, but after I run 5 miles It shows 212 miles left and after every engine turn on gets worser, sometimes milage comes back sometimes drops even lover, so what do you think, which part I must to repair ?
which part I must to repair
That's not the way we work here. Unless it's something very obvious like a leaking water pump we can't tell you what part to replace or repair. What we can do is suggest troubleshooting steps to find the source of the problem which in most cases could have multiple potential causes.
Are you actually measuring your mileage using your odometer? Onboard computer estimates can be substantially off.
See our FAQ section on fuel economy. You should also do a full diagnostic scan to get an idea of whats happening.
@chucktobias Diagnostic didn't show anything, on the screen only one issue engine malfunction writing on the screen and engine light... Just trying to find the way to fix it...
@gediminas2524 What codes were found? What do fuel trims look like? Are MAF and O2 sensor outputs OK?