What is the Mass Air Flow Sensor and where is it located on the Lexus ES300?

The Mass Airflow (MAF) sensor is located on the air intake duct and consists of a platinum hot wire, a thermistor, and a control circuit housed in plastic. This system detects temperature changes in the intake air through the hot wire and thermistor. As the throttle opens, more air flows over the hot wire, causing it to cool. The MAF sensor circuit adjusts the current flow through the hot wire to maintain a constant temperature. The PCM measures the output voltage signal from the MAF sensor, converts it into a digital waveform, compares it to the map, calculates the required fuel injector pulse width, and controls the injectors accordingly. Any issues with the MAF sensor circuit will trigger a diagnostic trouble code. To check the MAF sensor, verify power to the sensor and test for battery voltage. Assess the MAF sensor voltage signal to the PCM by reconnecting the electrical connector and observing the voltage while the engine idles and varies in speed. If the signal voltage is out of range, inspect the wiring harness for damage or connection problems. If the wiring and connectors are intact, it is likely that the MAF sensor is faulty. Before replacing the MAF sensor, check the circuit due to its high cost. For MAF sensor replacement, ensure the ignition key is in the OFF position and disconnect the electrical connector. Remove the sensor by loosening the retaining bolts and removing it along with the gasket. Installation involves reversing the removal steps and ensuring the installation of a new gasket between the MAF sensor and the intake duct.

Genuine Lexus ES300 Mass Air Flow Sensor

MAF Sensor Meter

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7 Mass Air Flow Sensors found

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Lexus ES300 Meter Sub-Assy, Intake Air Flow
Part Number: 22204-22010
$146.39 MSRP: $199.59
You Save: $53.20 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Air Mass Sensor, Mass Air Flow Sensor
- Replaces: 22204-0D030
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2002-2003 Lexus ES300 | 6 Cyl 3.0L, 6 Cyl 3.3L | 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Meter Sub-Assy, Intake Air Flow
Part Number: 22204-21010
$155.66 MSRP: $212.23
You Save: $56.57 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Air Mass Sensor, Mass Air Flow Sensor
- Replaces: 22204-07010
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1998-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Mass Air Flow Meter Sensor
Part Number: 22204-20010
$229.10 MSRP: $312.36
You Save: $83.26 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Meter Sub-Assy Intake Air Flow, Mass Air Flow Sensor; Air Mass Sensor, Meter Sub Assembly Inta, Intake Air Flow Meter Sub-Assembly
- Manufacturer Note: BRAZIL SPEC & W/O(VVT)
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1997-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Meter Assy, Intake Air Flow
Part Number: 22250-20010
Product Specifications
- Other Name: Air Flow Meter, Air Mass Sensor
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1993-1995 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK
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Lexus ES300 Meter Assy, Intake Air Flow
Part Number: 22250-62040
Product Specifications
- Other Name: Air Flow Meter, Air Mass Sensor
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1992-1994 Lexus ES300 | 6 Cyl 3.0L | 3VZFE; VCV10L-BTMGKA, VCV10L-BTMGKK, VCV10L-BTPGKA, VCV10L-BTPGKK
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Lexus ES300 Meter Assy, Intake Air Flow
Part Number: 22250-20020
Product Specifications
- Other Name: Air Mass Sensor, Mass Air Flow Sensor
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1994-1996 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK
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Lexus ES300 Meter Assy, Intake Air Flow
Part Number: 22250-20030
Product Specifications
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1994-1995 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK

Lexus ES300 Mass Air Flow Sensor

The Lexus ES300 Mass Air Flow Sensor informs the engine computer just how much air enters the intake to keep fuel delivery balanced to deliver power and low emissions. In all Lexuses, this device is a heated wire that is kept at a constant temperature and the amount of electrical current required to maintain that heat is a direct reflection of airflow in real time. Earlier models of the ES300 applied a vane air flow meter with a spring-loaded flap, but the moving parts in this design might limit breathing, so subsequent models of the ES300 use the hot wire Mass Air Flow Sensor, which is faster and less restrictive. The Mass Air Flow Sensor's signal is sent to the PCM, which uses the reading in conjunction with data on temperature and pressure to calibrate the injector pulse width to maintain the ideal air fuel ratio. A dirty wire, sticking vane, or unmetered air leaks could fool the PCM and the false reading by the Mass Air Flow Sensor would cause hesitation, stalling, warning lights, and wasted fuel, and Lexus owners should keep the Lexus ES300 Mass Air Flow Sensor clean for a smooth running performance.

Should you need to purchase new auto parts for your vehicle, we strongly suggest you consider the genuine Lexus ES300 Mass Air Flow Sensor available on LexusPartsNow.com. Our OEM Lexus ES300 Mass Air Flow Sensor come with the reassurance of the manufacturer's warranty, a hassle-free return policy, and speedy delivery service, all at affordable prices online. Feel free to shop with confidence!

Lexus ES300 Mass Air Flow Sensor Parts Questions & Experts Answers

Meter Sub-Assy, Intake Air Flow
22204-21010
Q: What is the Mass Air Flow Sensor and where is it located on the Lexus ES300?
A:
The Mass Airflow (MAF) sensor is located on the air intake duct and consists of a platinum hot wire, a thermistor, and a control circuit housed in plastic. This system detects temperature changes in the intake air through the hot wire and thermistor. As the throttle opens, more air flows over the hot wire, causing it to cool. The MAF sensor circuit adjusts the current flow through the hot wire to maintain a constant temperature. The PCM measures the output voltage signal from the MAF sensor, converts it into a digital waveform, compares it to the map, calculates the required fuel injector pulse width, and controls the injectors accordingly. Any issues with the MAF sensor circuit will trigger a diagnostic trouble code. To check the MAF sensor, verify power to the sensor and test for battery voltage. Assess the MAF sensor voltage signal to the PCM by reconnecting the electrical connector and observing the voltage while the engine idles and varies in speed. If the signal voltage is out of range, inspect the wiring harness for damage or connection problems. If the wiring and connectors are intact, it is likely that the MAF sensor is faulty. Before replacing the MAF sensor, check the circuit due to its high cost. For MAF sensor replacement, ensure the ignition key is in the OFF position and disconnect the electrical connector. Remove the sensor by loosening the retaining bolts and removing it along with the gasket. Installation involves reversing the removal steps and ensuring the installation of a new gasket between the MAF sensor and the intake duct.