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.

Cooling Fan Control System

Ford A/C relay primary control fails its electrical check

Cooling Fan Control System Fault

Radiator Fan Control System Fault

Exhaust Gas Temperature Control Bank 2 Limit Attained

Heated Catalyst Gate Voltage Signal Low

Ford historical A/C pressure input is above its voltage limit

Exhaust Gas Temperature Control Bank 1 Range Performance

Heated Catalyst Internal Control Module Checksum ROM Error

Ford historical A/C pressure input is below its voltage limit

Exhaust Gas Temperature Control Bank 2 Range Performance

Heated Catalyst Battery Temperature Sensor 1 Electrical

Ford A/C pressure does not change enough when the clutch engages

Heated Catalyst Battery Temperature Sensor 2 Electrical

Ford A/C demand was active when self-test expected otherwise

Fuel Level Sensor Circuit Ground Signal

Heated Catalyst Battery Temperature Sensor 1 or 2 Plausibility

A/C Relay Circuit Malfunction

EPW Power

Additive Pump Short To B+

Heated Catalyst Power Switch Temperature Sensor Plausibility

A/C Refrigerant Temperature Sensor Circuit Malfunction

Additive Pump Open Short To Ground

Heated Catalyst Comparison Battery Voltages of Power Switches Plausibility

EVAP Canister Purge Solenoid Valve Short To B+

Heated Catalyst Battery Disconnecting Switch Plausibility

EVAP Canister Purge Solenoid Valve Short To Ground

Ford A/C clutch cycles too frequently for the control strategy

EVAP Canister Purge Solenoid Valve Open

The leak-detection pump has an electrical circuit fault

Pressure Control Flap Vacuum Transducer Y312

EVAP Emission Control System LDP Circuit Electrical Malfunction

Leak-detection pump V144 has a supply-side circuit fault

Diagnostic Module Tank Leakage DM-TL Switching Solenoid Control Circuit Electrical

Leak-detection pump V144 circuit shorted to ground

Diagnostic Module Tank Leakage DM-TL Pump Current Plausibility

Fan Secondary High with Fans Off

Volkswagen leak-detection pump open circuit and canister sealing

Ford low-speed fan and hydraulic-fan systems use different P1474 tests

Leakage Diagnostic Pump Reed Switch Did Not Close

Auxiliary 5 Volt Output Too High

Fan Relay Low Circuit

Resonance Intake Line Switchover Valve Y227

a leak-detection pump signal fault is not a proven EVAP leak

Leakage Diagnostic Pump Clamped Tube

Too Little Secondary Air

Fan Relay High Circuit

Resonance Intake Manifold Switchover Valve Y226

Volkswagen EVAP pump insufficient vacuum: test the supply separately

Leakage Diagnostic Pump Reed Switch Did Not Open

Too Much Secondary Air

The evaporative leak-detection pump malfunctions

Battery Temp Sensor Voltage Out Of Limit

EVAP Emission Control System LDP Clamped Tube Detected

Ford high-speed cooling-fan relay control fails its electrical comparison

Transmission Fan Relay Circuit Open Or Shorted

Cooling Fan 1 Control Circuit High

Fan Secondary Low with Low Fans On

Preglow Control

Subaru cooling-fan relay high input

Fan Secondary Low with High Fans On

EATX RPM Pulse Generator Signal For Misfire Detection

Glow Plug Failure

Catalyst Temperature Sensor Circuit Shorted Low

Preglow Control Module N142

Engine Cooling System Performance

Engine Coolilng System Performance

Power to Cooling Fan Exceeded Normal Draw

Catalyst Temperature Sensor Circuit Shorted High

Variable Load Control Module Pin 1 Open

Catalytic Converter Overheat Detected

EGRV Circuit Malfunction

Air Injection Solenoid Circuit Open Or Shorted

EGR Vent Control Solenoid Circuit Fault

a Wrangler EVAP restriction needs more than a leak check

EGR Vacuum Control Solenoid Circuit Fault

EVAP Leak Monitor Pinched Hose Detected

Hi Speed Rad Fan CTRL Relay Circuit Open Or Shorted

EGR Boost Sensor Solenoid Circuit Fault

High Speed Radiator Fan Control Relay Circuit Fault