Audi OBD1 Trouble Codes
The following trouble codes are specific to Audi. You may also see Volkswagen trouble codes, since Audi and Volkswagen are of the same parent company.
Audi Trouble Codes Access
Without OBD Scan Tool
The trouble codes are displayed by using an LED connected to the data link connector (DLC). The ECM fault memory can also be checked and erased using diagnostic equipment connected to the data link connector (DLC). Self-diagnosis using flash type trouble codes may not display all available diagnostic information. Carry out road test for 10 minutes.
To access the trouble codes, proceed as follows:
- Ensure ignition is switched off.
- Bridge black data link connector (DLC) terminal 1 and brown or white data link connector (DLC) terminal 1
- With a switched lead - contacts normally open.
- Connect LED test lamp between black data link connector (DLC) terminal 2 and ECM terminal 33.
- 80: ECM located behind the passenger's glovebox.
- 100: ECM located in the plenum chamber.
Start engine. Allow to idle.
Note: If engine does not start, crank engine for 6 seconds. Leave ignition switched on.
- Operate switch for 4 seconds.
- Release switch. Check that LED flashes.
- Count LED flashes. Note trouble code.
- Each trouble code consists of four groups of one to four flashes.
- A 2,5 second pause separates each trouble code group.
- Repeat switch operation. Note trouble codes.
- End of test sequence indicated by trouble code 0000 (long flashes).
- Switch ignition off. Rectify faults as necessary.
Audi Trouble Codes Clearance
Method 1
- Ensure ignition is switched off.
- Bridge black data link connector (DLC) terminal 1 and brown or white data link connector (DLC) terminal 1 with a switched lead - contacts normally open.
- Operate switch and hold.
- Switch ignition on.
- Release switch after 5 seconds.
- Repeat checking procedure to ensure no data remains in ECM fault memory.
Method 2
- Ensure ignition is switched off.
- Disconnect ECM multi-plug or battery earth lead.
Note: ECM adaptive memory may be erased causing erratic running faults. Carry out road test to allow ECM to relearn basic values.
Warning: Disconnecting the battery may erase memory from electronic units, e.g., clock, radio.
Audi Flash Type 4-Digit Trouble Codes
- Click the table header to sort the table data by the respective column heading.
- Type keyword(s) in the table’s search box for a quick display of the searched data.
| Code(s) | Description | Probable Cause |
|---|---|---|
| 0 | End of test sequence | – |
| 1111 | Engine control module (ECM) | ECM |
| 1231 | Vehicle speed sensor (VSS) | Wiring, speedometer, VSS |
| 1232 | Idle speed control (ISC) actuator | Wiring, multi-plug incorrectly wired, ISC actuator |
| 2113 1 | Crankshaft position (CKP) sensor | Insecure rotor, wiring, CKP sensor |
| 2121 | Closed throttle position (CTP) switch | Accelerator cable adjustment, CTP switch adjustment, wiring, CTP switch |
| 2212 | Throttle position (TP) sensor | Wiring, poor connection, TP sensor |
| 2234 | Engine control module (ECM) – supply voltage | Battery, wiring |
| 2312 | Engine coolant temperature (ECT) sensor | Wiring, poor connection, ECT sensor |
| 2322 | Intake air temperature (IAT) sensor | Wiring, IAT sensor |
| 2341 2 | Heated oxygen sensor (HO2S) – lambda control | Heating inoperative, exhaust leak, misfire, fuel pressure/pump, EVAP canister purge valve |
| 2342 | Heated oxygen sensor (HO2S) | Wiring, HO2S, heating inoperative, fuel level low |
| 2413 2 | Mixture control (MC) | Fuel level low, fuel pressure/pump, intake/exhaust leak, misfire, HO2S, EVAP canister purge valve, injector, excessive fuel in engine oil |
| 4444 | No fault found | – |
Audi VAG Type 5-Digit Trouble Codes
- Click the table header to sort the table data by the respective column heading.
- Type keyword(s) in the table’s search box for a quick display of the searched data.
| Code(s) | Description | Probable Cause |
|---|---|---|
| 0 | No fault found | – |
| 281 | Vehicle speed sensor (VSS) | Wiring, speedometer, VSS |
| 282 | Idle speed control (ISC) actuator | Wiring, multi-plug incorrectly wired, ISC actuator |
| 00515 1 | Crankshaft position (CKP) sensor | Insecure rotor, wiring, CKP sensor |
| 516 | Closed throttle position (CTP) switch | Accelerator cable adjustment, CTP switch adjustment, wiring, CTP switch |
| 518 | Throttle position (TP) sensor | Wiring, poor connection, TP sensor |
| 522 | Engine coolant temperature (ECT) sensor | Wiring, poor connection, ECT sensor |
| 523 | Intake air temperature (IAT) sensor | Wiring, IAT sensor |
| 524 | Knock sensor (KS) | Wiring, KS |
| 525 | Heated oxygen sensor (HO2S) | Wiring, HO2S, heating inoperative, fuel level low |
| 532 | Engine control module (ECM) – supply voltage | Battery, wiring |
| 00537 2 | Heated oxygen sensor (HO2S) – lambda control | Heating inoperative, exhaust leak, misfire, fuel pressure/pump, EVAP canister purge valve |
| 525 | Heated oxygen sensor (HO2S) | Wiring, HO2S, heating inoperative, fuel level low |
| 00561 2 | Mixture control (MC) | Fuel level low, fuel pressure/pump, intake/exhaust leak, misfire, HO2S, EVAP canister purge valve, injector, excessive fuel in engine oil |
| 670 | Idle speed control (ISC) actuator position sensor | Wiring, throttle valve, ISC actuator position sensor |
| 17978 | Engine control module (ECM) immobilizer active | Incorrect/damaged key, incorrectly coded, ECM/immobilizer replacement without coding, wiring, immobilizer defective |
| 65535 | Engine control module (ECM) | ECM |