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Ford
🟡 Medium
Ford
P0051
FORD P0051 HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
The P0051 fault on your Ford indicates a FORD P0051 HO2S Heater Control Circuit Low (Bank 2 Sensor 1). Low voltage signal detected, often caused by poor electrical grounding, corroded harness pins, or a direct short-to-ground in the circuit.
Brand
Ford
Fault Code
P0051
Severity
🟡 Medium
Models
Focus, Fiesta, Mondeo, S-Max, C-Max, Kuga, Ranger
🛠️ Diagnostic Overview
Difficulty Level
🛠️🛠️
Medium (Moderate)
Estimated Time
⏱️ 1-2 Hours
🧰 Required Tools
- ✓ Digital Multimeter
- ✓ OBD2 Diagnostic Scanner
- ✓ Socket Wrench & Hand Tools
- ✓ Electrical Contact Cleaner Spray
⚠️ Possible Causes
- • Aging sensors reaching end of life
- • Moisture in the electrical connectors
- • Mechanical wear inside the Ford powertrain.
🔧 Recommended Fixes
- → Clean the sensor or connector with specialized electronic cleaner. If the fault returns, part replacement is necessary followed by an ECU reset.
🚗 Commonly Affected Vehicles
🏭 Ford – Other Common Fault Codes
U0100
FORD U0100 Lost Communication With ECM/PCM A
🚨 Critical
B1000
FORD B1000 Airbag Control Module Fault
🟡 Medium
P2293
FORD P2293 Fuel Pressure Regulator 2 Performance
🔴 High
P2279
FORD P2279 Intake Air System Leak
🟡 Medium
P2181
FORD P2181 Cooling System Performance
🟡 Medium
P2096
FORD P2096 Post Catalyst Fuel Trim System Too Lean
🟡 Medium
P2015
FORD P2015 Intake Manifold Runner Position Sensor Circuit Range
🔴 High
P1101
FORD P1101 MAF Sensor Out of Self Test Range
🟡 Medium
P0741
FORD P0741 Torque Converter Clutch Circuit Performance
🟡 Medium
P0700
FORD P0700 Transmission Control System Malfunction
🚨 Critical
P0600
FORD P0600 Serial Communication Link Malfunction
🟡 Medium
P0507
FORD P0507 Idle Control System RPM Higher Than Expected
🟡 Medium
P0500
FORD P0500 Vehicle Speed Sensor Malfunction
🟡 Medium
P0456
FORD P0456 EVAP System Leak Detected (very small leak)
🟡 Medium
P0455
FORD P0455 EVAP System Leak Detected (large leak)
🟡 Medium
P0442
FORD P0442 EVAP System Leak Detected (small leak)
🟡 Medium
P0441
FORD P0441 Evaporative Emission System Incorrect Purge Flow
🟡 Medium
P0430
FORD P0430 Catalyst System Efficiency Below Threshold Bank 2
🟡 Medium
P0420
FORD P0420 Catalyst System Efficiency Below Threshold
🟡 Medium
P0400
FORD P0400 Exhaust Gas Recirculation Flow Malfunction
🟡 Medium
P0340
FORD P0340 Camshaft Position Sensor Circuit Malfunction
🟡 Medium
P0335
FORD P0335 Crankshaft Position Sensor A Circuit Malfunction
🔴 High
P0325
FORD P0325 Knock Sensor 1 Circuit Malfunction
🟡 Medium
P0304
FORD P0304 Cylinder 4 Misfire Detected
🟡 Medium
P0303
FORD P0303 Cylinder 3 Misfire Detected
🟡 Medium
P0302
FORD P0302 Cylinder 2 Misfire Detected
🟡 Medium
P0301
FORD P0301 Cylinder 1 Misfire Detected
🔴 High
P0300
FORD P0300 Random/Multiple Cylinder Misfire Detected
🚨 Critical
P0234
FORD P0234 Turbocharger Overboost Condition
🚨 Critical
P0175
FORD P0175 System Too Rich Bank 2
🟡 Medium
P0174
FORD P0174 System Too Lean Bank 2
🔴 High
P0172
FORD P0172 System Too Rich Bank 1
🟡 Medium
P0171
FORD P0171 System Too Lean Bank 1
🔴 High
P0141
FORD P0141 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
🟡 Medium
P0135
FORD P0135 O2 Sensor Heater Circuit Malfunction
🟡 Medium
P0133
FORD P0133 O2 Sensor Circuit Slow Response
🟡 Medium
P0130
FORD P0130 O2 Sensor Circuit Malfunction
🔴 High
P0128
FORD P0128 Coolant Thermostat Malfunction
🟡 Medium
P0113
FORD P0113 Intake Air Temperature Circuit High Input
🟡 Medium
P0102
FORD P0102 Mass Air Flow Circuit Low Input
🟡 Medium
P0101
FORD P0101 Mass Air Flow Sensor Circuit Range/Performance
🟡 Medium
P0088
FORD P0088 Fuel Rail/System Pressure - Too High
🟡 Medium
P0087
FORD P0087 Fuel Rail/System Pressure - Too Low
🚨 Critical
P0016
FORD P0016 Crankshaft Position - Camshaft Position Correlation
🚨 Critical
P0012
FORD P0012 A Camshaft Position Timing Over-Retarded
🟡 Medium
P0011
FORD P0011 A Camshaft Position Timing Over-Advanced
🟡 Medium
P0010
FORD P0010 A Camshaft Position Actuator Circuit
🟡 Medium
P0401
EGR Flow Insufficient (EcoBoost / Duratorq TDCi)
🟡 Medium
P219A
Bank 1 Air-Fuel Ratio Imbalance (1.0 EcoBoost)
🟡 Medium
P0299
Turbocharger Underboost (1.6 EcoBoost Focus/Kuga)
🔴 High
P1316
Injector Circuit Fault / IDM Failure (Duratorq)
🔴 High
B10D5
BCM: Battery Saver Function Active
🟡 Medium
C1145
Wheel Speed Sensor Right Front Circuit Failure
🔴 High
U0155
Lost Communication with Instrument Panel Cluster
🟡 Medium
P0171
FORD P0171 System too Lean Bank 1
🔴 High
P0299
FORD P0299 Turbo Underboost
🔴 High
P0300
FORD P0300 Random Misfire
🔴 High
P0401
FORD P0401 EGR Flow Insufficient
🔴 High
P0420
FORD P0420 Catalyst Efficiency
🔴 High
P0507
FORD P0507 Idle Control High
🔴 High
P0700
FORD P0700 Transmission Control Fault
🔴 High
P1000
FORD P1000 OBD Readiness Test Not Complete
🔴 High
P1299
FORD P1299 Cylinder Head Temp Overtemp
🔴 High
U0101
FORD U0101 Lost Comm with TCM
🔴 High
P0032
FORD P0032 HO2S Heater Control Circuit High (Bank 1 Sensor 1)
🟢 Low
P0037
FORD P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
🚨 Critical
P0038
FORD P0038 HO2S Heater Control Circuit High (Bank 1 Sensor 2)
🚨 Critical
P0057
FORD P0057 HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
🚨 Critical
P0058
FORD P0058 HO2S Heater Control Circuit High (Bank 2 Sensor 2)
🔴 High
P0103
FORD P0103 Mass or Volume Air Flow Circuit High Input
🚨 Critical
P0107
FORD P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
🔴 High
P0108
FORD P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input
🔴 High
P0112
FORD P0112 Intake Air Temperature Circuit Low Input
🟢 Low
P0117
FORD P0117 Engine Coolant Temperature Circuit Low Input
🔴 High
P0118
FORD P0118 Engine Coolant Temperature Circuit High Input
🔴 High
P0122
FORD P0122 Throttle/Pedal Position Sensor/Switch A Circuit Low Input
🔴 High
P0123
FORD P0123 Throttle/Pedal Position Sensor/Switch A Circuit High Input
🟡 Medium
P0125
FORD P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
🟢 Low
P0131
FORD P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
🚨 Critical
P0132
FORD P0132 O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
🔴 High
P0134
FORD P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
🟢 Low
P0137
FORD P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
🔴 High
P0138
FORD P0138 O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
🟡 Medium
P0151
FORD P0151 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
🟢 Low
P0152
FORD P0152 O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
🟡 Medium
P0157
FORD P0157 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
🔴 High
P0158
FORD P0158 O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
🟢 Low
P0200
FORD P0200 Injector Circuit Malfunction
🚨 Critical
P0231
FORD P0231 Fuel Pump Secondary Circuit Low
🟡 Medium
P0232
FORD P0232 Fuel Pump Secondary Circuit High
🟡 Medium
P0327
FORD P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
🟡 Medium
P0328
FORD P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
🟢 Low
P0332
FORD P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
🔴 High
P0333
FORD P0333 Knock Sensor 2 Circuit High Input (Bank 2)
🚨 Critical
P0440
FORD P0440 Evaporative Emission Control System Malfunction
🟢 Low
P0443
FORD P0443 Evaporative Emission System Purge Control Valve Circuit
🟡 Medium
P0446
FORD P0446 Evaporative Emission System Vent Control Circuit Malfunction
🟢 Low
P0451
FORD P0451 Evaporative Emission System Pressure Sensor Range/Performance
🚨 Critical
P0452
FORD P0452 Evaporative Emission System Pressure Sensor Low Input
🟢 Low
P0453
FORD P0453 Evaporative Emission System Pressure Sensor High Input
🚨 Critical
P0462
FORD P0462 Fuel Level Sensor Circuit Low Input
🔴 High
P0463
FORD P0463 Fuel Level Sensor Circuit High Input
🔴 High
P0502
FORD P0502 Vehicle Speed Sensor Circuit Low Input
🟢 Low
P0503
FORD P0503 Vehicle Speed Sensor Intermittent/Erratic/High
🟡 Medium
P0505
FORD P0505 Idle Control System Malfunction
🟢 Low
P0506
FORD P0506 Idle Control System RPM Lower Than Expected
🚨 Critical
P0562
FORD P0562 System Voltage Low
🔴 High
P0563
FORD P0563 System Voltage High
🔴 High
P0601
FORD P0601 Internal Control Module Memory Check Sum Error
🔴 High
P0603
FORD P0603 Internal Control Module Keep Alive Memory (KAM) Error
🟢 Low
P0604
FORD P0604 Internal Control Module Random Access Memory (RAM) Error
🟡 Medium
P0605
FORD P0605 Internal Control Module Read Only Memory (ROM) Error
🟢 Low
P0606
FORD P0606 ECM/PCM Processor Fault
🔴 High
P0705
FORD P0705 Transmission Range Sensor Circuit Malfunction (PRNDL Input)
🟡 Medium
P0706
FORD P0706 Transmission Range Sensor Circuit Range/Performance
🔴 High
P0715
FORD P0715 Input/Turbine Speed Sensor Circuit Malfunction
🟡 Medium
P0720
FORD P0720 Output Speed Sensor Circuit Malfunction
🚨 Critical
P0722
FORD P0722 Output Speed Sensor No Signal
🔴 High
P0731
FORD P0731 Gear 1 Incorrect Ratio
🔴 High