Operation 11: Catalytic converter diagnosis
WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Test conditions
- Engine running at idling speed
Display on VAS5051:
1 - Enter display group
- Enter "198" for "display group number 198" in zone -2- and confirm entry by pressing -Q- button.
Display on VAS5051:
- Activate basic setting by pressing -A- button.
- Press accelerator and brake pedal simultaneously. Engine speed increases to approx. 2200 RPM.
Test conditions
- Accelerator and brake pedal pressed simultaneously, engine runs at approx. 2200 RPM.
- Check indication in display fields -2- and -4-.
| Display zones | ||||
| 1 | 2 | 3 | 4 | |
| Display group 198: Diagnosis of catalytic converter (Bank 1 and Bank 2) | ||||
| Display | x.xx | --- | x.xx | --- |
| Display | Measured value catalytic converter - conversion, Bank 1 | Diagnosis status | Measured value catalytic converter - conversion, Bank 2 | Diagnosis status |
| Range | Test OFF Test ON Cat. B1 OK Cat. B1 NOK |
Test OFF Test ON Cat. B2 OK Cat. B2 NOK |
||
| Specif.value | 0...0.35 | Cat. B1 OK | 0...0.35 | Cat. B2 OK |
| Note: | If "Cat. B1 NOK" is displayed: Check DTC memory. Refer to Diagnostic Trouble Code (DTC) memory, checking . If no DTC is stored, replace catalytic converter. | If "Cat. B1 NOK" is displayed: Check DTC memory. Refer to Diagnostic Trouble Code (DTC) memory, checking . If no DTC is stored, replace catalytic converter. | ||
If specified value "Cat. B1 OK" is obtained:
- Press ← button.
- Depress accelerator pedal completely (swiftly) and then release it (brief acceleration to at least 4000 RPM).
WARNING:
Test procedure cannot continue successfully without this brief acceleration!
- Perform next operation.