Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2009 Audi S4 AutomaticFACTORY OEM SERVICE PROCEDURE
Diagnostic Mode 05: Check lambda test results: Notes
Mode 05 allows access to the Oxygen Sensor test results. Mode 05 is divided into test identifiers (TIDS).
NOTE:
- Depending on scan tool and protocol used, diagnostic mode 05 and the information provided may be referred to by a different name.
| Test-ID (Hex-ID) | Component or System |
|---|---|
| 01 ($01): Test-ID 01 ($01): Oxygen Sensor in front of Catalytic Converter Bank 1 - Sensor 1 | Oxygen Sensor in front of Catalytic Converter Bank 1 - Sensor 1 |
| 02 ($02): Test-ID 02 ($02): Oxygen Sensor Behind Catalytic Converter Bank 1- Sensor 2 | Oxygen Sensor Behind Catalytic Converter Bank 1- Sensor 2 |
| 05 ($05): Test-ID 05 ($05): Oxygen Sensor in front of Catalytic Converter Bank 2 - Sensor 1 | Oxygen Sensor in front of Catalytic Converter Bank 2 - Sensor 1 |
| 06 ($06): Test-ID 06 ($06): Oxygen Sensor Behind Catalytic Converter Bank 2 - Sensor 2 | Oxygen Sensor Behind Catalytic Converter Bank 2 - Sensor 2 |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.