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.
Function 07 - Coding Engine Control Module
If Engine Control Module (ECM) is replaced, it is necessary to code new ECM. If new ECM is not properly coded, the following problems may occur:
- Driveability problems (i.e., harsh shifting).
- False malfunctions stored in ECM memory.
- Increased fuel consumption.
- Increased exhaust emissions.
- Reduction in transmission life.
- All ECM functions are not carried out (i.e., EVAP system operation).
Connect VAS 5051 scan tool to Data Link Connector (DLC). DLC is located behind cover under left side of steering column. See Figure. On scan tool, select vehicle system "01 - ENGINE ELECTRONICS". From selection 1, select diagnostic function "07 - CODE CONTROL MODULE". Press "Q" button to confirm input. Following scan tool instructions, access ECM coding information. Enter ECM code as necessary. For ECM coding options, see ENGINE CONTROL MODULE CODING OPTIONS (A4) table.
As an example, a properly coded ECM for an A4 model with Front Wheel Drive (FWD) with traction control (ASR/ESP) and 5-speed automatic transmission would display as 16501 on the VAS 0551 scan tool.
| Application/Code | Option | |||
|---|---|---|---|---|
| Country/Emissions | ||||
| 16 | (1) USA ULEV | |||
| Drive/Additional Functions | ||||
| 0 | Front Wheel Drive With Anti-Lock Brake System | |||
| 2 | All Wheel Drive With Anti-Lock Brake System | |||
| 5 | Front Wheel Drive With Traction Control (ASR/ESP) | |||
| 3 | All Wheel Drive With Traction Control (ESP) | |||
| Transmission | ||||
| 0 | 5-Speed Manual Transmission | |||
| 5 | Automatic Transmission 01V | |||
| Vehicle Type | ||||
| 1 | A4 | |||
|
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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.
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