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.

Maxima EVAP pressure sensing includes its hose connection

Fuel-tank pressure compared with the leak-pump pressure sensor

Fuel-tank pressure voltage below the electrical lower limit

Fuel-tank pressure voltage exceeds the permitted signal range

An apparent refueling event caused by an unstable pressure signal

Weak EVAP vacuum can mean a large leak or a purge blockage

A small EVAP leak can be detected after the engine is switched off

A refueling event changes the interpretation of an EVAP gross-leak result

Purge-solenoid control output low while the driver is off

Purge-solenoid high feedback during an active low-side command

low-pressure EGR command circuit open-load evidence

low-pressure EGR position tracking outside tolerance

low-pressure EGR short-to-ground indication during drive

low-pressure EGR command short toward the power supply

low-pressure EGR does not return to its closed default

Volkswagen CJAA low-pressure EGR stuck-closed monitor

A broad fuel-level circuit code can represent either electrical extreme

A fuel-level reading that barely changes while fuel is consumed

Low fuel-level sender data received through the tank module

High fuel-level signal on an ECM-connected float circuit

A fuel-level jump that falsely resembles refueling

EVAP Purge Flow Sensor Circuit

EVAP Purge Flow Sensor Circuit Range/Performance

EVAP Purge Flow Sensor Circuit Low

EVAP Purge Flow Sensor Circuit High

EVAP Purge Flow Sensor Circuit Intermittent

Catalyst Temperature Sensor 1/2 Correlation Bank 1

Catalyst Temperature Sensor 1/2 Correlation Bank 2

EGR position differs from the commanded target

A short EGR position excursion differs from a valve stuck open

EGR pressure-sensor performance and its pressure hose

EGR Sensor B Circuit Intermittent/Erratic

Ford 6.0L exhaust pressure is implausibly high before running

Exhaust pressure offset is compared with ambient pressure after shutdown

Exhaust-pressure low-circuit evidence must retain the source’s labeling caveat

A high exhaust-pressure circuit signal is separate from real overpressure

An erratic exhaust-pressure code can be a model disagreement

exhaust throttle open circuit with an off-state driver

exhaust throttle position-tracking performance

exhaust throttle command short-to-ground detection

exhaust throttle command circuit short to power

Exhaust Pressure Control Valve A Intermittent

Exhaust Pressure Sensor B Circuit

Exhaust Pressure Sensor B Circuit Range/Performance

Exhaust Pressure Sensor B Circuit Low

Exhaust Pressure Sensor B Circuit High

Exhaust Pressure Sensor B Circuit Intermittent/Erratic

exhaust-flap binding can remain after an ECU update

Fan 1 relay-control opening detected with the driver off

Fan relay channel two reports an electrical command mismatch

The third fan relay output has its own feedback check

Fan performance uses weighted command-following evidence

Fan Circuit Current High

Fan Power/Ground Circuit

Volkswagen CJAA low-pressure EGR position-sensor circuit

Ford 6.0L EGR throttle actuator circuit fault

Ford throttle open-position learning is outside its limits

high-pressure EGR short-to-ground current signature

exhaust throttle fails its spring-return position check

Volkswagen CJAA exhaust-flap position signal low

Volkswagen CJAA exhaust-flap closed-position learning

exhaust throttle SENT position feedback below range

exhaust throttle position signal above its raw upper limit

Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Intermittent/Erratic

high-pressure EGR command short to the power supply

bank 1 secondary-air flow can fail at several points

bank 2 secondary-air flow and the paired-code clue

Fan Overspeed

Measured cooling-fan speed falls short of a modeled response

Fan speed high is judged against an estimated limit

Tank vacuum develops even though purge is commanded closed

EVAP purge-flow assessment from tank-pressure response

EVAP vent circuit low is a power-stage grounding report

EVAP vent circuit high reflects a short-to-battery status

EGR B Flow

insufficient low-pressure EGR in the air-flow model

excessive low-pressure EGR inferred from fresh-air mismatch

high-pressure EGR closed-stop learning is outside its window

low-pressure EGR endpoint learning exceeds permitted limits

Exhaust Pressure Control Valve B