P CODE FAMILY

Powertrain code references — Page 42.

Engine, transmission and powertrain diagnostic references. Exact vehicle and module context still matters.

Ford / Lincoln +1

P1177

These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.

Synchronization Fault

Long Term Fuel Trim Too Rich Banks 1 And 2 (FMFR)

Oxygen Sensor Correction Behind Catalyst Bank 1 Limit Attained

O2 Sensor Signal Circuit Slow Switching From Rich to Lean Bank 1 Sensor 1

Long Term Fuel Trim Too Lean Banks 1 And 2 (AMFR)

Linear Oxygen Sensor Pump Current Open

O2 Sensor Signal Circuit Slow Switching From Rich to Lean Bank 2 Sensor 1

Long Term Fuel Trim Too Rich Banks 1 And 2 (AMFR)

Linear Oxygen Sensor Pump Current Short To Ground

O2 Sensor Signal Circuit Slow Switching From Rich to Lean Bank 1 Sensor 2

Fuel Delivery System Malfunction Low

Linear Oxygen Sensor Pump Current Short To B+

O2 Sensor Signal Circuit Slow Switching From Rich to Lean Bank 2 Sensor 2

Fuel Delivery System Malfunction High

Linear Oxygen Sensor Reference Voltage Open

O2 Sensor Bank 1 Sensor 2 Open Circuit During Coast Down Fuel Cut-off

Fuel Shut Off Solenoid Circuit

Linear Oxygen Sensor Reference Voltage Short To Ground

O2 Sensor Bank 2 Sensor 2 Open Circuit During Coast Down Fuel Cut-off

Engine Oil Temperature Circuit Malfunction

Linear Oxygen Sensor Reference Voltage Short To B+

Engine Oil Temperature Out Of Self Test Range

Linear Oxygen Sensor Common Ground Wire Open

Engine Oil Temperature Circuit

FTS High Fuel Pump Temperature Sensor High

O2 Sensor Heater Circuit Open, Hardware Fault

Linear Oxygen Sensor Common Ground Wire Short To Ground

O2 Sensor Heater Control Circuit Bank 1 Sensor 2

EOT Circuit Performance

FTS Low Fuel Pump Temperature Sensor Low

O2 Sensor Heater Circuit Shorted, Hardware Fault

Linear Oxygen Sensor Common Ground Short To B+

O2 Sensor Heater Control Circuit Bank 2 Sensor 2

EOT Sensor Circuit Low Voltage

Variant Selection

O2 Sensor Heater Circuit Open, Inferred Fault

Linear Oxygen Sensor Compensation Resistor Open

Fuel Control Bank 1 Sensor 1

EOT Sensor Circuit High Voltage

Calibration Memory Fault

O2 Sensor Heater Circuit Resistance

Linear Oxygen Sensor Compensation Resistor Short To Ground

Fuel Control Bank 2 Sensor 1

Engine Oil Pressure Switch Circuit

Pump Speed Signal Fault

O2 Sensor Heater Circuit Low Resistance Fault 1

Pump Speed Signal

Linear Oxygen Sensor Compensation Resistor Short To B+

Pre-Catalyst Fuel Trim System Bank 1

Engine Vacuum Leak

Calibration Resistor Out Of Range

O2 Sensor Heater Circuit Low Resistance Fault 2

Linear Oxygen Sensor Reference Voltage Incorrect Signal

Pre-Catalyst Fuel Trim System Bank 2

Intake Air Duct Air Leak

Key Line Voltage

O2 Sensor Heater Circuit Open, HArdware Fault

TP Controlled Circuit

Post-Catalyst Fuel Trim System Bank 1

Voltage External

O2 Sensor Heater Circuit Shorted

Inlet Air Temp. Circuit Low

Post-Catalyst Fuel Trim System Bank 2

EGR Drive Overcurrent

O2 Sensor Heater Circuit Open, Inferred Fault

Inlet Air Temp. Circuit High

ECU A/D Converter

O2 Sensor Heater Circuit Resistance Fault

Incorrect Or Irrational Performance Has Been Detected For The PWM

ECM PCM A D Converter

SCP HBCC Failed To Initialize

O2 Sensor Heater Circuit Low Resistance Fault 1

O2 Sensor 1/1 (Bank 1 Sensor 1) Slow During Catalyst Monitor

EGR Boost Or Pressure Sensor Circuit Fault

EGR Boost Sensor Circuit

Key Off Voltage High

O2 Sensor Heater Circuit Low Resistance Fault 2

O2 Sensor 2/1 (Bank 2 Sensor 1) Slow During Catalyst Monitor

Ignition Switch Start Circuit Fault

Ignition Switch Start Circuit