Check your catalytic converter.
A hole or a crack in the exhaust or muffler.
All O2 sensors are screwed into the exhaust system. Follow the exhaust pipes from the engine rearward and you will find them all.
Trouble code P0401 means: Exhaust Gas Recirculation Malfunction
Take it to Midas Muffler.
Take it to a muffler shop.
They have two. One is right off the engine on the exhaust manifold and one is after the cat
If you get the one made for it.
i had my ford focus 2004 1.6 complete exhaust system replaced at the local garage for £334
There are two: 1 is in the backside of the exhaust manifold off the front of the engine, near the front fan shroud. The other is the passenger side exhaust just before the and catalytic converter assembly.
the exhaust just like every other car
How do you turn of the engine on a new ford focus
it is located right in front of the car behind the fan.THAT'S THE EXHAUST MANIFOLD, THE INTAKE MANIFOLD IS ON THE *..BACK..* OF THE ENGINE. FOLLOW THE AIR INTAKE.