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 wording
Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.
P0101MAF SEN/CIRCUIT-B1Manufacturer communications
4Original wording in English
NISSAN
Reported code forms P0101
2017-2019 PATHFINDER; MIL ON WITH DTC P0101 STORED IF YOU CONFIRM The MIL is ON and DTC P0101 (MAF SEN/CIRCUIT-B1) is stored in the ECM. ACTION 1. Confirm the current ECM part number. 2. Reprogram the ECM, if applicable.
NISSAN
Reported code forms P0101
MIL ON WITH DTC P0087, P0101, P0448, OR P2008, VEHICLES REGISTERED OUTSIDE OF CALIFORNIA This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
NISSAN
Reported code forms P0101
Engine Control Module (ECM) Reprogram California Voluntary Emissions Service Campaign ***** Campaign Summary***** Nissan is conducting a Voluntary Emissions Service Campaign on approximately 104,221 specific Nissan…
NISSAN
Reported code forms P0101
MIL ON WITH DTC P0087, P0101, P0448, OR P2008 This bulletin has been amended. See AMENDMENT HISTORY on the last page. Please discard previous versions of this bulletin.
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 | PATHFINDER | 2018 |
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.