Audi A4

B9 (2016-2023)

2016 - 2023

Fifth generation A4 with Virtual Cockpit, advanced driver assistance, and improved efficiency. Available in sedan and Avant.

Faults

High Priority

Easy Fixes

Why does my Audi A6 C8 (2018-2024) have a rough idle and a P0300 code?

When your Audi A6 C8 (2018-2024) exhibits a rough idle and displays a P0300 code, it indicates that there is a random/multiple cylinder misfire detected by the Engine Control Module (ECM). Here’s a de

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Fuel filter dirty Audi A4

Learn how to diagnose and replace a dirty fuel filter on an Audi A4 B9 (2016-2023). Follow our step-by-step guide to resolve symptoms like engine misfires and stalling.

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Diagnose fuel injector clogged Audi A4

Learn how to diagnose and address clogged fuel injectors in an Audi A4 B9 (2016-2023) with this detailed guide. Symptoms include rough idling and poor acceleration.

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2-4 hoursrepair time

fuel injector

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P0300-P0306, P0171-P0174

Poor fuel economy solution A4

Learn how to diagnose and repair poor fuel economy issues in your Audi A4 B9. Follow our comprehensive guide to improve MPG and engine performance.

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2-4 hoursrepair time

fuel economy

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How to fix fuel pump failure Audi A4

Learn how to diagnose and repair fuel pump failure in your Audi A4 B9 with this comprehensive guide. Includes symptoms, diagnostic steps, and repair instructions.

Cooling fan not working Audi A4 B9

Learn how to diagnose and repair a non-working cooling fan on an Audi A4 B9 (2016-2023) to prevent engine overheating issues.

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2-3 hoursrepair time

cooling fan

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Thermostat stuck A4 B9

Learn how to diagnose and replace a stuck thermostat in an Audi A4 B9. Follow our step-by-step guide to ensure a successful repair.

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Radiator failure Audi A4

Learn how to diagnose and repair radiator failure in Audi A4 B9 models (2016-2023). Follow detailed steps to address engine overheating, coolant leaks, and more.

Diagnose coolant leak Audi A4

Learn how to diagnose and repair a coolant leak in your Audi A4 B9 (2016-2023) with this comprehensive guide. Identify symptoms, perform diagnostic steps, and fix common leak sources.

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3-5 hoursrepair time

cooling system

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Brake fluid leak solution A4

Learn how to diagnose and repair a brake fluid leak in an Audi A4 B9 (2016-2023) with detailed steps and required tools.

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3-4 hoursrepair time

brake system

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How to fix abs light on Audi A4

Learn how to diagnose and fix the ABS light issue on Audi A4 B9 with this step-by-step guide. Includes symptoms, diagnostic steps, and repair instructions.

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ABS system

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Brake noise Audi A4 B9

Learn how to diagnose and resolve brake noise issues in your Audi A4 B9 with this comprehensive guide. Follow step-by-step instructions for inspection, diagnosis, and repair.

Brake pedal soft A4 B9

Learn how to diagnose and fix a soft brake pedal on the Audi A4 B9 (2016-2023). Follow these steps to ensure optimal braking performance.

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2-3 hoursrepair time

brake system

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Dashboard lights flickering Audi A4

Learn how to diagnose and fix flickering dashboard lights in your Audi A4 B9 with this step-by-step guide. Includes tools, diagnostic steps, and repair instructions.

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2-4 hoursrepair time

electrical system

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Diagnose fuse keeps blowing Audi A4

Learn how to diagnose and fix a repeatedly blowing fuse in your Audi A4 B9. Follow our step-by-step guide to identify and resolve electrical issues.

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2-4 hoursrepair time

fuse/electrical circuit

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Electrical short circuit solution A4

Learn how to diagnose and repair an electrical short circuit in an Audi A4 B9 (2016-2023) with this comprehensive guide, including symptoms, tools, and steps.

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electrical system

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How to fix alternator failure Audi A4

Learn how to diagnose and repair alternator failure in an Audi A4 B9 (2016-2023) with this comprehensive guide, including symptoms, diagnostic steps, and tools required.

Battery not charging Audi A4 B9

Learn how to diagnose and fix the battery not charging issue in an Audi A4 B9. Follow step-by-step instructions to troubleshoot alternator, battery, and wiring problems.

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2-4 hoursrepair time

charging system

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Transmission overheating A4 B9

Learn how to diagnose and repair transmission overheating issues in the Audi A4 B9 with this comprehensive guide. Includes symptoms, diagnostic steps, and repair instructions.

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Gear won't engage Audi A4

Learn how to diagnose and fix gear engagement issues in Audi A4 B9 models (2016-2023). Follow our expert guide for symptoms, tools, and step-by-step instructions.

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Diagnose transmission fluid leak Audi A4

Learn how to diagnose and identify the source of a transmission fluid leak in an Audi A4 B9, including symptoms, tools required, and diagnostic steps.

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transmission

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Hard shifting solution A4

Learn how to diagnose and resolve hard shifting issues in Audi A4 B9 models (2016-2023) with this comprehensive guide.

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3-5 hoursrepair time

transmission

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How to fix transmission slipping Audi A4

Learn how to diagnose and fix transmission slipping issues in your Audi A4 B9, including checking fluid levels, scanning for DTCs, and updating software.

Engine stalling Audi A4 B9

Learn how to diagnose and repair engine stalling issues in Audi A4 B9 (2016-2023) with this comprehensive guide. Follow step-by-step instructions to ensure safety and accuracy.

Engine won't start A4 B9

Learn how to diagnose and fix an Audi A4 B9 engine that won't start with this comprehensive guide. Includes symptoms, diagnostic steps, and repair instructions.

Oil consumption high Audi A4

Learn how to diagnose and repair high oil consumption in Audi A4 B9 models. Follow our detailed guide for symptoms, diagnostic steps, and repair instructions.

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engine

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Diagnose engine overheating Audi A4

Learn how to diagnose and fix engine overheating issues in Audi A4 B9 models. Follow step-by-step instructions for checking coolant levels, inspecting leaks, and more.

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4-6 hoursrepair time

cooling system

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Engine knocking solution A4

Learn how to diagnose and fix engine knocking in Audi A4 B9 models. Follow these steps to resolve knocking issues and improve engine performance.

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How to fix loss of power Audi A4

Learn how to diagnose and fix loss of power issues in Audi A4 B9 models. Follow detailed steps to address engine performance problems effectively.

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3-5 hoursrepair time

engine performance

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Rough idle Audi A4 B9

Learn how to diagnose and repair rough idle issues in Audi A4 B9 models (2016-2023) with this comprehensive guide. Includes symptoms, diagnostic steps, and repair instructions.

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2-4 hoursrepair time

Engine

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P0300, P0301-P0304, P0171, P0174

Engine misfire A4 B9

Learn how to diagnose and repair engine misfires in the Audi A4 B9. Follow our step-by-step guide to identify symptoms, perform diagnostic checks, and fix common issues.

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Check engine light on Audi A4

Learn how to diagnose and repair the Check Engine Light issue on your Audi A4 B9 (2016-2023) with this comprehensive guide. Includes symptoms, diagnostic steps, and tools required.