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THE CODE DIRECTORY

Diagnostic code references — Page 18.

Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.

11,786 code references

Generic OBD-II
P040D

EGR Temperature Sensor A Circuit High

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Generic OBD-II
P040E

EGR Temperature Sensor A Circuit Intermittent/Erratic

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Generic OBD-II
P040F

EGR Temperature Sensor A/B Correlation

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Generic OBD-II
P0410

AIR System A

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Generic OBD-II
P0411

AIR System A Incorrect Flow Detected

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Generic OBD-II
P0412

AIR System Switching Valve A Circuit

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Generic OBD-II
P0413

AIR System Switching Valve A Circuit Open

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Generic OBD-II
P0414

AIR System Switching Valve A Circuit Shorted

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Generic OBD-II
P0415

AIR System Switching Valve B Circuit

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Generic OBD-II
P0416

AIR System Switching Valve B Circuit Open

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Generic OBD-II
P0417

AIR System Switching Valve B Circuit Shorted

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Generic OBD-II
P0418

AIR System Control A Circuit

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Generic OBD-II
P0419

AIR System Control B Circuit

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Generic OBD-II
P041A

EGR Temperature Sensor B Circuit

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Generic OBD-II
P041B

EGR Temperature Sensor B Circuit Range/Performance

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Generic OBD-II
P041C

EGR Temperature Sensor B Circuit Low

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Generic OBD-II
P041D

EGR Temperature Sensor B Circuit High

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Generic OBD-II
P041E

EGR Temperature Sensor B Circuit Intermittent/Erratic

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Generic OBD-II
P041F

AIR System Switching Valve A Circuit Low

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Generic OBD-II
P0420

Catalyst System Efficiency Below Threshold Bank 1

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Generic OBD-II
P0421

Catalyst 1 Efficiency Below Threshold Bank 1

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Generic OBD-II
P0422

Catalyst 2 Efficiency Below Threshold Bank 1

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Generic OBD-II
P0423

Heated Catalyst Efficiency Below Threshold Bank 1

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Generic OBD-II
P0424

Heated Catalyst Temperature Below Threshold Bank 1

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Generic OBD-II
P0425

Catalyst Temperature Sensor Circuit Bank 1 Sensor 1

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Generic OBD-II
P0426

Catalyst Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1

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Generic OBD-II
P0427

Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 1

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Generic OBD-II
P0428

Catalyst Temperature Sensor Circuit High Bank 1 Sensor 1

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Generic OBD-II
P0429

Catalyst Heater Control Circuit/Open Bank 1

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Generic OBD-II
P042A

Catalyst Temperature Sensor Circuit Bank 1 Sensor 2

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Generic OBD-II
P042B

Catalyst Temperature Sensor Circuit Range/Performance Bank 1 Sensor 2

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Generic OBD-II
P042C

Catalyst Temperature Sensor Circuit Low Bank 1 Sensor 2

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Generic OBD-II
P042D

Catalyst Temperature Sensor Circuit High Bank 1 Sensor 2

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Generic OBD-II
P042E

EGR A Control Stuck Open

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Generic OBD-II
P042F

EGR A Control Stuck Closed

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Generic OBD-II
P0430

Catalyst System Efficiency Below Threshold Bank 2

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Generic OBD-II
P0431

Catalyst 1 Efficiency Below Threshold Bank 2

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Generic OBD-II
P0432

Catalyst 2 Efficiency Below Threshold Bank 2

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Generic OBD-II
P0433

Heated Catalyst Efficiency Below Threshold Bank 2

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Generic OBD-II
P0434

Heated Catalyst Temperature Below Threshold Bank 2

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Generic OBD-II
P0435

Catalyst Temperature Sensor Circuit Bank 2 Sensor 1

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Generic OBD-II
P0436

Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 1

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Generic OBD-II
P0437

Catalyst Temperature Sensor Circuit Low Bank 2 Sensor 1

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Generic OBD-II
P0438

Catalyst Temperature Sensor Circuit High Bank 2 Sensor 1

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Generic OBD-II
P0439

Catalyst Heater Control Circuit/Open Bank 2

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Generic OBD-II
P043A

Catalyst Temperature Sensor Circuit Bank 2 Sensor 2

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Generic OBD-II
P043B

Catalyst Temperature Sensor Circuit Range/Performance Bank 2 Sensor 2

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Generic OBD-II
P043C

Catalyst Temperature Sensor Circuit Low Bank 2 Sensor 2

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Generic OBD-II
P043D

Catalyst Temperature Sensor Circuit High Bank 2 Sensor 2

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Generic OBD-II
P043E

EVAP System Leak Detection Reference Orifice Low Flow

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Generic OBD-II
P043F

EVAP System Leak Detection Reference Orifice High Flow

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Generic OBD-II
P0440

EVAP System

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Generic OBD-II
P0441

EVAP System Incorrect Purge Flow

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Generic OBD-II
P0442

EVAP System Leak Detected (small leak)

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Generic OBD-II
P0443

EVAP System Purge Control Valve A Circuit

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Generic OBD-II
P0444

EVAP System Purge Control Valve A Circuit Open

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Generic OBD-II
P0445

EVAP System Purge Control Valve A Circuit Shorted

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Generic OBD-II
P0446

EVAP System Vent Control Circuit

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Generic OBD-II
P0447

EVAP System Vent Control Circuit Open

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Generic OBD-II
P0448

EVAP System Vent Control Circuit Shorted

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Generic OBD-II
P0449

EVAP System Vent Valve Control Circuit/Open

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Generic OBD-II
P044A

EGR Sensor C Circuit

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Generic OBD-II
P044B

EGR Sensor C Circuit Range/Performance

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Generic OBD-II
P044C

EGR Sensor C Circuit Low

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Generic OBD-II
P044D

EGR Sensor C Circuit High

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Generic OBD-II
P044E

EGR Sensor C Circuit Intermittent/Erratic

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Generic OBD-II
P044F

AIR System Switching Valve A Circuit High

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Generic OBD-II
P0450

EVAP System Pressure Sensor/Switch A Circuit

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Generic OBD-II
P0451

EVAP System Pressure Sensor/Switch A Circuit Range/Performance

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Generic OBD-II
P0452

EVAP System Pressure Sensor/Switch A Circuit Low

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Generic OBD-II
P0453

EVAP System Pressure Sensor/Switch A Circuit High

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Generic OBD-II
P0454

EVAP System Pressure Sensor/Switch A Circuit Intermittent

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Generic OBD-II
P0455

EVAP System Leak Detected - Large Leak

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Generic OBD-II
P0456

EVAP System Leak Detected (very small leak)

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Generic OBD-II
P0457

EVAP System Leak Detected (fuel cap loose/off)

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Generic OBD-II
P0458

EVAP System Purge Control Valve A Circuit Low

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Generic OBD-II
P0459

EVAP System Purge Control Valve A Circuit High

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Generic OBD-II
P045A

EGR B Control Circuit

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Generic OBD-II
P045B

EGR B Control Circuit Range/Performance

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Generic OBD-II
P045C

EGR B Control Circuit Low

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Generic OBD-II
P045D

EGR B Control Circuit High

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Generic OBD-II
P045E

EGR B Control Stuck Open

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Generic OBD-II
P045F

EGR B Control Stuck Closed

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Generic OBD-II
P0460

Fuel Level Sensor A Circuit

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Generic OBD-II
P0461

Fuel Level Sensor A Circuit Range/Performance

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Generic OBD-II
P0462

Fuel Level Sensor A Circuit Low

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Generic OBD-II
P0463

Fuel Level Sensor A Circuit High

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Generic OBD-II
P0464

Fuel Level Sensor A Circuit Intermittent

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Generic OBD-II
P0465

EVAP Purge Flow Sensor Circuit

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Generic OBD-II
P0466

EVAP Purge Flow Sensor Circuit Range/Performance

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Generic OBD-II
P0467

EVAP Purge Flow Sensor Circuit Low

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Generic OBD-II
P0468

EVAP Purge Flow Sensor Circuit High

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Generic OBD-II
P0469

EVAP Purge Flow Sensor Circuit Intermittent

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Generic OBD-II
P046A

Catalyst Temperature Sensor 1/2 Correlation Bank 1

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Generic OBD-II
P046B

Catalyst Temperature Sensor 1/2 Correlation Bank 2

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Generic OBD-II
P046C

EGR Sensor A Circuit Range/Performance

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Generic OBD-II
P046D

EGR Sensor A Circuit Intermittent/Erratic

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Generic OBD-II
P046E

EGR Sensor B Circuit Range/Performance

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Generic OBD-II
P046F

EGR Sensor B Circuit Intermittent/Erratic

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Generic OBD-II
P0470

Exhaust Pressure Sensor A Circuit

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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.