P0101

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.

Scan worksheet →

Manufacturer wording

Source wording can vary by vehicle and suffix. It is shown as written, not as a universal diagnosis.

Original wording in English

A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.

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.

1. Audi TT Quick Reference Specification Book · October 2013 ↗

   Audi of America · PDF page(s) 130 · 2013-10

2. NTB12-051k · Nissan; MIL ON with DTC P0101 ↗

   Nissan North America · PDF page(s) 1, 4, 5, 6, 7 · 2016-12-01

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.