Ford Focus: Common Codes & Fixes

Real-world diagnostic data for the Ford Focus. These are the codes techs see most often. Tap any code for the full vehicle-specific fix and the exact part.

20 codes have specific fixes for the Ford Focus
B1000 On Ford sedans, B1000 is frequently caused by a failing GEM (Generic Electronic Module) or water intrusion through the cowl area. 2008-2018 · easy DIY · 30 min - 1 hour B1342 On Ford sedans, B1342 is frequently caused by low battery voltage during cranking. 2008-2019 · easy DIY · 15-30 min B1601 If B1601 appeared after a battery disconnect or PCM reset, the PATS module lost its key memory. 2005-2019 · moderate DIY · 30-45 min C1154 Ford EPS C1154 codes often trace to a low battery voltage issue (EPS requires 11+ volts). 2008-2016 · Easy DIY · 30 min diagnostic P0031 Bank 1 sensor 1 heater circuit low is frequently caused by a blown PCM relay-fed heater fuse rather than the sensor itself. 2005-2014 · Easy DIY · 30-45 min P0191 On smaller Ford EcoBoost engines, P0191 can be caused by fuel quality issues in addition to sensor failure. 2011-2020 · easy DIY · 15-30 min P0222 Failed throttle body TPS sensor -- the entire throttle body is replaced as an assembly on drive-by-wire systems. 2008-2016 · easy DIY · 20-30 min P0231 Ford sedans and crossovers have the fuel pump connector inside the trunk or under the rear seat. 2010-2020 · moderate DIY · 1-2 hours P0262 EcoBoost engines use high-pressure direct injectors that draw significantly more current than port injectors. 2010-2019 · moderate DIY · 1-2 hours P0313 Weak fuel pump struggles to maintain rail pressure when the tank is below 1/4. 2005-2016 · moderate DIY · 2-3 hours P0322 Replace CKP sensor (Motorcraft DU-88). 2004-2011 · easy DIY · 30 min P0353 Cylinder 3 coil failure is often caused by coolant intrusion from a leaking thermostat housing gasket directly above it. 2012-2020 · Easy DIY · 0.5-1 hour P0445 Check the purge solenoid wiring for a short to ground. 2008-2018 · moderate DIY · 30 min - 1 hour P0606 Before replacing the PCM, check all power and ground circuits. 2005-2015 · easy DIY · 30 min (diagnostic) P1129 Ford P1129 = 'Secondary Heated Oxygen Sensors Swapped.' Someone wired bank 1 sensor 2 and bank 2 sensor 2 to each other's connectors, OR… 2000-2006 · easy DIY · 15 min P1200 P1200 on Focus and Ranger 4-cylinders is usually a bad injector harness connector or a stuck injector. 2000-2008 · Moderate DIY · 1-2 hours P2112 Throttle plate stuck closed from carbon buildup. 2005-2014 · moderate DIY · 1 hour P2118 After throttle body replacement, always perform the PCM relearn. 2010-2017 · easy DIY · 15 min P2187 Check the brake booster check valve and hose -- a cracked check valve causes a big idle vacuum leak that only shows at idle (P2187)… 2005-2015 · easy DIY · 15 min P2506 P2506 = battery voltage saw an unexpected disconnect or dip. 2008-2016 · easy DIY · 20 min

Frequently Asked Questions

What are the most common check engine light codes on a Ford Focus?

The most commonly reported OBD-II codes for the Ford Focus include B1000, B1342, B1601, C1154, P0031. Each code indicates a specific issue -- tap any code above for the full diagnostic breakdown.

How much does it cost to fix a check engine light on a Ford Focus?

Repair costs vary by code. Many Ford Focus fixes like gas cap replacement, sensor cleaning, or spark plug changes are under $50 in parts and can be done at home. More complex repairs like catalytic converter or transmission work can run $500-$2,000+ at a shop.

Can I drive my Ford Focus with the check engine light on?

It depends on the code. A steady check engine light usually means you can drive short distances safely. A flashing check engine light means stop driving immediately -- continued driving can cause serious engine damage. Scan the code first to know what you are dealing with.

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