You can find common Ford Focus fault codes on this page that when clicked take you to a detailed description.
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Ford Focus Recalls
When a car manufacturer detects a problem with a model they put out a recall notice and more often than not offer to fix the problem free of charge.
You can check to see if your Ford Focus has any recall notices on our sister site AutoRecalls.co, sorted by model year.View Ford Focus Recalls »
Common Focus Fault Codes
These are the most common Focus fault codes that people are searching for.
Sec.Air Inj.Sys.Circ Short to B+Learn More
Diesel Particulate Filter Efficiency Below Threshold Bank 1Learn More
PATS Received Incorrect Key-Code From Ignition Key TransponderLearn More
Fuel Sender Circuit OpenLearn More
Passenger Sid, Side mount Airbag Circuit OpenLearn More
PATS Ignition Key Transponder Signal Is Not ReceivedLearn More
Seatbelt Driver Pretensioner Circuit OpenLearn More
Battery Voltage LowLearn More
Pressure Transducer Main / Primary Input Circuit FailureLearn More
CAN Communication Bus FaultLearn More
Exhaust Gas Recirculation Flow MalfunctionLearn More
Main Relay Circ.Learn More
Audio Rear Integrated Control Panel Unit is Not RespondingLearn More
Lost Communication With Body Control ModuleLearn More
SCP (J1850) Communication Bus FaultLearn More
Park / Neutral Switch Input CircuitLearn More
Clutch Actuator Circuit LowLearn More
Evaporative Emission Control System Pressure Sensor MalfunctionLearn More
Cooling Fan 1 Control Circuit MalfunctionLearn More
Camshaft Position Sensor B Circuit (Bank 2)Learn More
Vehicle Speed Sensor MalfunctionLearn More
Turbocharger/Supercharger Boost Control 'A' Circuit LowLearn More
Evaporative Emission Control System Purge Control Valve circuit MalfunctionLearn More
Output Speed Sensor Circuit MalfunctionLearn More
Fuel Pump A Control Circuit LowLearn More
Fan 1 Control Circuit LowLearn More
Cruise Control/Brake Switch A Circuit MalfunctionLearn More
Fuel Pump Secondary Circuit LowLearn More
Transmission Control System ElectricalLearn More
Input/Turbine Speed Sensor Circuit MalfunctionLearn More
TCM Power Input Signal LowLearn More
O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)Learn More
Cylinder Head Temperature Sensor Detected Engine Overheating ConditionLearn More
Fuel Inj.Air Contr.ValveLearn More
System readiness test not completeLearn More
Turbocharger bypassLearn More
O2 Sensor Heater Circ. Bank 2-Sensor 1 OpenLearn More
EGR Temp.Sensor Range/PerformanceLearn More
Needle Lift SensorLearn More
EGR Different Pressure Sensor Signal too LowLearn More
Engine coolant temperatureLearn More
Accelera.Pedal Pos.SensorLearn More
O2 Sensor HeatingLearn More
Theft Detected - Engine DisabledLearn More
Misfire detected Reason: Fuel level too lowLearn More
Fuel Pump Driver Module off-lineLearn More
Bank 2-Sensor 1 InternalLearn More
- Manufacturer: Ford
About the Focus
The Focus first entered the market in 1998 as a compact family car. The primary intention of the model was for Ford to release a compact car that is sold under the same badge worldwide, which it succeeded in doing so.
Since its release, there has been a total of four generations to hit the market. The fourth and latest of these was unveiled in 2019.
One of the most common issues that Focus owners have reported is one that a lot of cars that have been on the market for a while suffer from. P0420 indicates that there is an issue with the catalytic converter’s performance.
For a lot of older vehicles, this can be a result of wear and tear causing the converter to fail. In some cases, this can also be the result of faulty oxygen sensors in the exhaust system.
Another code that owners have reported is P0171, which has affected a number of Ford engines over the years. This code indicates that the engine is running too lean.
One of the first steps in fixing this problem is checking the MAF sensor for any issues. Vacuum leaks are another notorious cause of this code.
Fault code P0456 is another common code that has been reported. This code is logged when a small leak in the EVAP system is detected.
With some luck, this code is a sign that the gas cap is simply not fastened correctly. However, it is possible that there is an actual leak coming from a faulty component somewhere.