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.

Intake Manifold Runner Control Actuator Internal Performance Bank 1

Intake Manifold Runner Control Actuator Internal Performance Bank 2

Reductant Pump A Stuck On

Bank 2 runner over-travel requires valid position feedback

A low bank 2 runner position signal is not proof the runners are closed

Bank 2 runner feedback is electrically high before position can be trusted

Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 2

the CAED EVAP temperature circuit is evaluated in a defined voltage band

EVAP temperature performance includes communication and module checks

low EVAP temperature-circuit voltage is not a cold-vapor diagnosis

the high-voltage label is paired with a current criterion in Audi's chart

EVAP Fuel Vapor Temperature Sensor Circuit Intermittent

Fuel Fired Heater Disabled

reductant tank-heater openness is evaluated when heating starts

Reductant Tank Heater Control Circuit Low

Reductant Tank Heater Control Circuit High

Reductant Leakage

Ram reductant-injector performance and DCU compatibility

Reductant/Regeneration Supply Control Circuit Range/Performance

Fuel Fired Heater Performance

Ford exhaust-temperature sensor 2 disagrees with its model

EGT sensor 2 low-range diagnosis depends on sensor type

EGT sensor 2 high-range fault needs sensor-type confirmation

Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 2

Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 2

Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 2

Reductant Injection Air Pressure Sensor A Circuit

Reductant Injection Air Pressure Sensor A Circuit Range/Performance

Reductant Injection Air Pressure Sensor A Circuit Low

Ford DEF level-sensor open-load circuit fault

When the DEF level sensor cannot provide a trustworthy measurement

reductant level low-circuit code comes from smart-sensor status

Why a DEF level circuit-high label can mean an excessive reported height

Ram DEF-level errors during uneven thawing

Ford calculates insufficient remaining DEF range

Reductant Injection Air Pressure Sensor A Circuit High

Reductant Injection Air Pressure Sensor A Circuit Intermittent

Reductant Temperature Sensor A Circuit

Ford DEF tank temperature fails a cold-start comparison

Reductant Temperature Sensor A Circuit Low

Reductant Temperature Sensor A Circuit High

Reductant Temperature Sensor A Circuit Intermittent

DEF dosing valve 1 open-circuit status

first DEF valve has a low-side short-to-ground indication

first reductant valve control is shorted toward battery supply

reductant pressure feedback below 0.1 V is an electrical finding

The reductant pressure plausibility check before pressurization

Why a zero DEF pressure reading can hide an electrical low signal

high reductant pressure-sensor voltage can display zero pressure

How cumulative pressure movement exposes an erratic DEF signal

reductant pressure did not build after repeated attempts

Reductant Injection Valve Circuit/Open Bank 2 Unit 1

Reductant Injection Valve Circuit Low Bank 2 Unit 1

Reductant Injection Valve Circuit High Bank 2 Unit 1

second DEF metering valve open-circuit evidence

DEF valve 2 low-side ground-short supervision

second DEF valve control has a short-to-supply signature

Reductant Injection Valve Circuit/Open Bank 2 Unit 2

Reductant Injection Valve Circuit Low Bank 2 Unit 2

Reductant Injection Valve Circuit High Bank 2 Unit 2

Reductant Injection Air Pump Control Circuit/Open

high reductant-temperature signal can represent an open circuit

reductant tank temperature disagrees after a cold soak

low tank-temperature signal can represent an electrically hot reading

Why a high DEF temperature-sensor voltage represents a cold extreme

Recognizing an erratic DEF tank temperature signal

Reductant System Performance Bank 2

Reductant Injection Air Pump Control Circuit Low

Reductant Injection Air Pump Control Circuit High

Reductant/Regeneration Supply Control Circuit/Open

Reductant/Regeneration Supply Control Circuit Low

Reductant/Regeneration Supply Control Circuit High

secondary fuel-level inactivity depends on tank state and distance

Fuel level sensor B noise is detected through repeated large changes

A low fuel-level sensor B circuit is not a direct empty-tank measurement

A high fuel-level sensor B circuit should not be read as a full tank

Fuel Level Sensor B Circuit Intermittent

Reductant Quality Sensor Circuit

reductant quality data remains unavailable when it should be ready

quality-sensor circuit low combines measurement and piezo faults