What does this code mean?
Measured air flow does not agree with the expected operating range or the controller's plausibility model. This is a performance code, not the same as a circuit-low or circuit-high code. It does not prove the MAF sensor needs replacement: the cited Nissan bulletin includes a software-related scenario without drivability symptoms.
Sources and interpretation [1]
A code identifies a detected condition, not a part that must automatically be replaced.
Before replacing a part
Save the operating conditions and other codes. Review the correct MAF plausibility test before condemning the sensor. For the Nissan example, match the exact vehicle, engine and current ECM part number against the bulletin's tables before considering reprogramming.
Manufacturer communications
2Original wording in English
NISSAN
Reported code forms P0101
MIL ON WITH DTC P0101 This bulletin has been amended. The APPLIED VEHICLES section on this page and Table A on page 7 have been updated. Discard all previous versions of this bulletin.
NISSAN
Reported code forms P0101
IF YOU CONFIRM The MIL is ON with DTC P0101 for Mass Air Flow sensor (MAF) stored in the ECM, AND there are no drivability concerns. ACTION 1. Refer to step 6 in the SERVICE PROCEDURE to confirm this bulletin applies to…
Check vehicle applicability
1A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
| Make | Model | Model year |
|---|---|---|
| Nissan | ALTIMA | 2012 |
Sources and interpretation
These explanations are editorial summaries of the linked manufacturer material. PDF page numbers count from the first file page. Original publications are in English; translations are reference aids. A cited edition is not a claim that it is the manufacturer's latest instruction.
- Audi TT Quick Reference Specification Book · October 2013 ↗
Audi of America · PDF page(s) 130 ·
- NTB12-051k · Nissan; MIL ON with DTC P0101 ↗
Nissan North America · PDF page(s) 1, 4, 5, 6, 7 ·
Source check date · 2026-10-27
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.