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

Jaguar AJ16 rich adaptive fuel-flow correction

Oxygen Sensor Correction Behind Catalyst Bank 1 Limit Attained

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

Jaguar AJ16 lean air-flow adaptation and idle evidence

Linear Oxygen Sensor Pump Current Open

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

Jaguar AJ16 rich air-flow adaptation

Linear Oxygen Sensor Pump Current Short To Ground

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

Ford natural-gas fuel delivery is inferred too low

Linear Oxygen Sensor Pump Current Short To B+

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

Ford natural-gas fuel delivery is inferred too 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

Ford engine-oil-temperature signal intermittently fails

Linear Oxygen Sensor Reference Voltage Short To B+

Ford oil-temperature input is outside engine-running self-test range

Linear Oxygen Sensor Common Ground Wire Open

Engine Oil Temperature Circuit

FTS High Fuel Pump Temperature Sensor High

Jaguar AJ16 upstream oxygen-heater open-circuit 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

Jaguar AJ16 upstream oxygen-heater short-circuit diagnosis

Linear Oxygen Sensor Common Ground Short To B+

O2 Sensor Heater Control Circuit Bank 2 Sensor 2

EOT Sensor Circuit Low Voltage

Variant Selection

Jaguar upstream heater fault with temperature-related possibilities

Linear Oxygen Sensor Compensation Resistor Open

Fuel Control Bank 1 Sensor 1

EOT Sensor Circuit High Voltage

Calibration Memory Fault

Jaguar upstream oxygen-heater high resistance

Linear Oxygen Sensor Compensation Resistor Short To Ground

Fuel Control Bank 2 Sensor 1

Engine Oil Pressure Switch Circuit

Pump Speed Signal Fault

Jaguar upstream heater low-resistance classification

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

Jaguar upstream heater fault and excessive system voltage

Linear Oxygen Sensor Reference Voltage Incorrect Signal

Pre-Catalyst Fuel Trim System Bank 2

Intake Air Duct Air Leak

Key Line Voltage

Jaguar downstream oxygen-heater open-circuit fault

TP Controlled Circuit

Post-Catalyst Fuel Trim System Bank 1

Voltage External

Jaguar downstream heater short and the upstream cross-reference

Inlet Air Temp. Circuit Low

Post-Catalyst Fuel Trim System Bank 2

EGR Drive Overcurrent

Jaguar downstream heater fault with inferred operating causes

Inlet Air Temp. Circuit High

ECU A/D Converter

Jaguar downstream heater resistance and intermittent wiring

Incorrect Or Irrational Performance Has Been Detected For The PWM

ECM PCM A D Converter

SCP HBCC Failed To Initialize

Jaguar downstream heater classification and installation checks

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

Jaguar downstream heater fault and supply-voltage evidence

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

Ignition Switch Start Circuit Fault

Ignition Switch Start Circuit