Reference meaning
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.
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A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
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.
Scan worksheet →Manufacturer wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0AA9Leak Sensor Detection Circuit
Manufacturer communications
2Original wording in English
AUDI
This bulletin provides service informaiton for intermittent DTC P0AA900 in 008C.
MITSUBISHI
This is a Service Campaign Bulletin sent to dealers. This bulletin supersedes TSB-18-54-005, issued July, 2018. The bulletin informs dealers that updated software for the sub-BMU was released to address the additional DTC P0AA9 (Leak Sensor Detection Circuit.) The bulletin also revises the production date of affected vehicles, s…
Check vehicle applicability
13A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Audi | A6 SPORTBACK E-TRON ↗ | 2027 |
| Audi | A6 SPORTBACK E-TRON ↗ | 2025 |
| Audi | Q6 E-TRON ↗ | 2027 |
| Audi | Q6 E-TRON ↗ | 2025 |
| Audi | Q6 SPORTBACK E-TRON ↗ | 2027 |
| Audi | Q6 SPORTBACK E-TRON ↗ | 2025 |
| Audi | S6 SPORTBACK E-TRON ↗ | 2027 |
| Audi | S6 SPORTBACK E-TRON ↗ | 2025 |
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.