What does this code mean?
The wording below belongs to the named make and communication. Match the complete code, reporting module, model year and engine before applying it.
A code identifies a detected condition, not a part that must automatically be replaced.
Manufacturer communications
1Original wording in English
MACK
Reported code forms U02A3
USE FOR NEW VEHICLES (US21+OBD22 Emissions) - Intermittent Diagnostic Trouble Codes U02A3, U029D, U029E
Check vehicle applicability
25A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
Historical vehicle association; OBD-II compatibility is not established by this record.
| Make | Model | Model year |
|---|---|---|
| Mack | R | 1992Historical records |
| Mack | R | 1991Historical records |
| Mack | R | 1990Historical records |
| Mack | R | 1989Historical records |
| Mack | R | 1988Historical records |
| Mack | R | 1987Historical records |
| Mack | R | 1984Historical records |
| Mack | R | 1983Historical records |
| Mack | R | 1982Historical records |
| Mack | R | 1979Historical records |
| Mack | R | 1978Historical records |
| Mack | R | 1977Historical records |
Historical records · 802 · Historical vehicle association; OBD-II compatibility is not established by this record.
Before replacing a part
Record codes and freeze-frame data. Check battery condition, related codes and visible wiring or hose damage. Follow the vehicle's diagnostic procedure and test results before replacing parts.
Can I keep driving?
A code alone cannot establish whether driving is safe. A flashing malfunction light, severe shaking, overheating, oil-pressure warning or loss of braking or steering needs prompt attention. Stop in a safe place and seek assistance when control or engine safety is affected. Follow the vehicle handbook.