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P0101

Overview

Code

P0101

Code Type

P

Code Class

P0

System

Engine

Severity Level

Medium

Emissions Related

true

Drivability Impact

Minor

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0101 indicates that the mass air flow (MAF) sensor signal is outside the expected range or does not match engine operating conditions calculated by the ECM

Symptoms

Check Engine Light illuminated; Hesitation during acceleration; Rough idle; Reduced engine power; Poor fuel economy

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

The engine management system uses MAF data to control fuel injection and ignition timing Incorrect readings can affect combustion efficiency and emissions

Possible Causes

Dirty or contaminated MAF sensor; Intake air leaks; Incorrect MAF sensor installation; Wiring or connector issues in the MAF circuit; Faulty ECM (rare)

Diagnostic Steps

1 Scan for additional fault codes; 2 Inspect the air intake system for leaks or restrictions; 3 Check MAF sensor wiring and connectors; 4 Clean the MAF sensor if contamination is present; 5 Compare live MAF data with expected values based on RPM and load; 6 Replace the MAF sensor if readings remain out of range

Drive Safety Notes

Driving with code P0101 is usually possible, but performance and fuel efficiency may be reduced Prolonged operation can lead to increased emissions

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