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OBD diagnostic scanner displaying five common DEF fault codes

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DEF Diagnostic Trouble Codes DEF System Troubleshooting

DEF Fault Codes: P20EE, P207F, P203F, P204F and P205B

by definbulk

July 18, 2026

DEF Fault Codes: P20EE, P207F, P203F, P204F and P205B A diagnostic trouble code records a test the vehicle failed; it does not...

Alice Qelvin

Our author researches Diesel Exhaust Fluid systems, vehicle maintenance, emissions technology, and troubleshooting to provide clear, accurate, practical guidance for diesel owners, drivers, technicians, and fleet professionals worldwide every day.

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DEF Crystallization Causes, Cleaning and Prevention

DEF Sensor Problems Symptoms, Testing and Repair

DEF Fault Codes: P20EE, P207F, P203F, P204F and P205B

DEF System Problems, Causes, Derate, Reset and Repair

Diesel Diagnostics

DEF Fault Codes: P20EE, P207F, P203F, P204F and P205B

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© 2026, All Rights Reserved.

DEF Guides

Troubleshooting

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DEF Crystallization Causes, Cleaning and Prevention

DEF Sensor Problems Symptoms, Testing and Repair

DEF Fault Codes: P20EE, P207F, P203F, P204F and P205B

DEF System Problems, Causes, Derate, Reset and Repair

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Diesel Diagnostics

DEF Fault Codes: P20EE, P207F, P203F, P204F and P205B

Subscribe to our newsletter and stay updated.

© 2026, All Rights Reserved.

DEF Guides

Troubleshooting

Follow Us