Ford Focus Fault Codes
You can find common Ford Focus fault codes on this page that when clicked take you to a detailed description.
You can also type in the fault code you are getting below to find a more 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
Catalyst System Efficiency Below Threshold (Bank 1)Learn More Fixes
System Too Lean (Bank 1)Learn More Fixes
Diesel Particulate Filter Efficiency Below Threshold Bank 1Learn More
PATS Received Incorrect Key-Code From Ignition Key TransponderLearn More
Fuel Sender Circuit OpenLearn More
ECU Is DefectiveLearn More Fixes
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
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)Learn More Fixes
CAN Communication Bus FaultLearn More
O2 Sensor Signal Stuck RichLearn More Fixes
Exhaust Gas Recirculation Flow MalfunctionLearn More
Turbo / Super Charger UnderboostLearn More Fixes
Evaporative Emissions System Small Leak DetectedLearn More Fixes
Main Relay Circ.Learn More
Lost Communication With ECM/PCM "A"Learn More Fixes
Audio Rear Integrated Control Panel Unit is Not RespondingLearn More
Lost Communication With Body Control ModuleLearn More
Lost Communication With Instrument Panel Cluster (IPC) Control ModuleLearn More Fixes
High Speed CAN Communication BusLearn More Fixes
Control Module Communication Bus "A" OffLearn More Fixes
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
Bank 1 Air/Fuel Ratio ImbalanceLearn More Fixes
Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)Learn More Fixes
O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)Learn More Fixes
ECM/PCM Processor FaultLearn More Fixes
Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance ProblemLearn More Fixes
Cylinder 1 Misfire DetectedLearn More Fixes
Intake Camshaft Position Actuator Circuit / Open (Bank 1)Learn More Fixes
Cooling Fan 1 Control Circuit MalfunctionLearn More
Camshaft Position Sensor B Circuit (Bank 2)Learn More
Glow Plug/Heater Circuit A Malfunction More details...Learn More Fixes
Vehicle Speed Sensor MalfunctionLearn More
Turbocharger/Supercharger Boost Control 'A' Circuit LowLearn More
Intake Air Temperature Circuit High InputLearn More Fixes
System Too Rich (Bank 1)Learn More Fixes
Cylinder 3 Misfire DetectedLearn More Fixes
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
Crankshaft Position Camshaft Position Correlation Bank 1 Sensor BLearn More Fixes
Camshaft Position Sensor Circuit Range/PerformanceLearn More Fixes
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
Camshaft Position Sensor Circuit MalfunctionLearn More Fixes
Secondary Air Injection System Incorrect Flow DetectedLearn More Fixes
Fuel Rail/System Pressure - Too LowLearn More Fixes
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
O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)Learn More Fixes
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.
The Focus has become somewhat of an icon in the hatchback class. This has meant it goes up against other big names in the class like the Honda Civic, Opel Astra, and of course, the VW Golf.
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.