Focus Fanatics Forum banner
1 - 4 of 4 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 ·
I'm trying to sort my focus out, it starts and the automatic choke comes on no problem then goes down to idle, but when i give it a rev it sounds like it's misfiring, i have put new plugs and leads on it but this has made no difference.
My son inlaw put his diagnostic meter in and these are the fault codes it came up with. Any help as to what the codes are and what i can do to fix this would be greatly appreciated.
311294
 

·
Registered
Joined
·
121 Posts
Year, engine, mileage would be helpful.

My wild guess is coil(s). No clue about the first trans related code...
 

·
Registered
2012 Focus SE hatchback black
Joined
·
1,250 Posts
P0723 possible causes are:
Defective Output Speed Sensor
Corroded or damaged connector
Faulty or damaged wiring
Dirty or contaminated fluid
Dirty or clogged transmission filter
Defective Coolant Temperature Sensor
Defective Transmission Valve Body
Restricted hydraulic passages
Faulty Shift Solenoid
Faulty PCM
Usually, it's just the OSS or the wiring or connector/plug though.

The P0301 and P0304 are cylinder #1 and #4 misfires. It can be caused by an ignition, fuel, timing, or compression problem. Usually, it's a bad spark plug, ignition coil, or fuel injector. Sometimes the wiring or connectors to the coils or injectors can be the issue.
More rarely low/high fuel pressure, air intake leaks, or bad pistons rings or other physical damage can also cause misfires but you tend to get more codes with these.
 
1 - 4 of 4 Posts
Top