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.

Bank 1 rich-at-idle monitoring uses a learned negative additive correction

Bank 2 lean-at-idle monitoring needs the correct additive trim channel

Why bank 2 throttle stop learning can fail at several different stages

Throttle/Fuel Inhibit B Circuit

Throttle/Fuel Inhibit B Circuit Range/Performance

Throttle/Fuel Inhibit B Circuit Low

Throttle/Fuel Inhibit B Circuit High

Reductant performance uses correlation between dosing, pump effort, and pressure

Bank 2 rich-at-idle evidence is a learned trim result, not a parts diagnosis

high-load lean correction is evaluated after adaptation stabilizes

rich correction uses the lower multiplicative boundary

Bank 2 runs lean in the upper part-load adaptation range

Bank 2 runs rich in the upper part-load adaptation range

A bank 1 lean-biased oxygen-sensor diagnosis based on learned offset

Why a rich-biased bank 1 sensor code can depend on a negative lambda offset

The bank 2 lean-biased sensor check uses an adapted lambda quantity

Bank 2 rich-biased oxygen sensing and the lower lambda-offset boundary

intake-temperature correlation depends on airflow and boost state

Bank 1 imbalance inferred from oxygen-signal variation

Bank 2 air-fuel imbalance is evaluated after fuel adaptation

cylinder one can be imbalanced in either mixture direction

interpret cylinder-two imbalance against the correct bank baseline

cylinder-three imbalance requires trustworthy timing information

do not infer a cylinder-four part failure from the imbalance code

cylinder-five imbalance can be hidden by a normal-looking bank average

evaluate cylinder six during an eligible mixture-comparison window

cylinder-seven imbalance has rich and lean diagnostic branches

cylinder-eight imbalance needs a cylinder result and a bank reference

Cylinder 9 Air-Fuel Ratio Imbalance

Cylinder 10 Air-Fuel Ratio Imbalance

Cylinder 11 Air-Fuel Ratio Imbalance

Cylinder 12 Air-Fuel Ratio Imbalance

Reductant Level Sensor B Circuit

Reductant Level Sensor B Circuit Range/Performance

reductant level channel two reports a short-to-ground status

level-channel-two circuit-high covers two reported fault types

Reductant Level Sensor B Circuit Intermittent/Erratic

Reductant Level Sensor C Circuit

Reductant Level Sensor C Circuit Range/Performance

level-channel-three low circuit is a discrete error report

channel-three circuit-high can mean open load or short to battery

Reductant Level Sensor C Circuit Intermittent/Erratic

Excessive Time To Enter Closed Loop NOx Adsorber Control

Closed Loop NOx Adsorber Control At Limit - Too High

NOx Adsorber - Over Temperature Bank 1

NOx Adsorber - Over Temperature Bank 2

Cold Start Cylinder 1 Injection Timing

Cold Start Cylinder 2 Injection Timing

Cold Start Cylinder 3 Injection Timing

Cold Start Cylinder 4 Injection Timing

Cold Start Cylinder 5 Injection Timing

Cold Start Cylinder 6 Injection Timing

Cold Start Cylinder 7 Injection Timing

Cold Start Cylinder 8 Injection Timing

Cold Start Cylinder 9 Injection Timing

Cold Start Cylinder 10 Injection Timing

Cold Start Cylinder 11 Injection Timing

Cold Start Cylinder 12 Injection Timing

Reductant heater relay open detection uses a commanded power-stage state

Reductant heater relay low-circuit detection uses excessive current

Reductant heater voltage remains present with the power stage off

available reductant level data stays too still during expected slosh

Reductant Level Sensor B Stuck

Reductant power-relay monitoring checks both commanded directions

Reductant Control Module Power Relay/Relays Control Circuit Low

Reductant Control Module Power Relay/Relays Control Circuit High

Reductant Control Module Supply Voltage Circuit

Comparing the reductant controller supply with reported vehicle voltage

The reductant control module reports supply voltage above its limit

A reductant quality-module low-supply code includes a wider voltage statement

Reductant Quality Module Performance

The injector B open-load check for cylinder 1

An injector B open-load code with an unresolved channel-to-cylinder mapping

Understanding the cylinder 3 injector B open-circuit category

Open-load evidence for injector B without assuming the source’s channel number

Keeping injector-channel identity separate from a cylinder 5 open-load label

The cylinder 6 injector B open-load test uses an inactive output

A cylinder 7 injector B open-load diagnosis with a separate document channel

Understanding the electrical evidence behind a cylinder 8 injector B open code

Cylinder 9 Injector B Circuit/Open