A miss in a 2001 ford focus - 2001 Ford Focus

Probably nothing.
The code means the gas tank can not be sealed to prevent vapors from escaping.
Common causes are a missing gas cap when the engine is running, or a faulty hose from the tank to the vapor canister.

Check the pcv hose that connects to the intake manifold.

check the belt for it maybe missing

good chance you have a bad coil causing the miss fire. mist some water over your coils see if that makes a change in how the car idles if it gets worse or if you have single coils over your plugs look to see if they are broken. or if you have wires you might see some sparks from the current. that is a good way to go.

check spark plugs and wires. if u have already done this i apologize

Hi, I am selling my car and have put the factory 6000CD Radio
back in. However, I have lost the code

Can anyone help?

Ford Mondeo 2001
My serial number is M247168 FD6000

code P401 is exhaust gas recirculation-insufficient flow detected.

your fuel delivery module is under recall. 10 years from the date of original purchase (by anyone) from Ford. Recall campaign 03N01. Ford will play dumb at first, it's a "silent" recall. there are more here: http://www-odi.nhtsa.dot.gov/cars/problems/recalls

Vibrations while driving are usually caused by missing/broken motor mounts, wheel bearings, unbalanced tires, or worn/bent 1/2 axles.
Improper tires (or winter tires) may also contribute.
Get a second opinion!
There are too many things on a 2001 that could be wrong.

what type of cyl. problem, compression ,miss fire, if it is a comp. issue more than likely you have a nead gasket problem,you can check this by performing a cyl.compression test you can purchase the tool the other two issuses are simplely fixed by replacing those sensors this could very well elimate the other problem