Engine-Codes - Generic - P1102

P1102 - Mass Air Flow Sensor In Range But Lower Than Expected

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1102 Possible Causes

  • Faulty mass air flow sensor
  • Dirty mass air flow sensor
  • Dirty mass air filter
  • Mass air flow sensor harness is open or shorted
  • Mass air flow sensor circuit poor electrical connection
  • Intake air leaks

How is the P1102 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Tech Notes

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

What is the cost to diagnose the P1102 code

Labor: 1.0

The cost to diagnose the P1102 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected?

A voltage from the sensor is constantly approx. 1.0V when engine is running.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine stall
  • Engine running rough
  • Excessive fuel consumption
  • Excessive smoke

P1102 Meaning

The Mass Air Flow (MAF) sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).

The temperature of the hot film is controlled by the ECM acertain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the ECM must supply more electric current to maintain the temperature of the hot film as air flow increases. The ECM detects the air flow by means of this current change.

More Information

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Information for specific makes

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