Parts for your 2004 Toyota Highlander-Maf sensor

2004 Toyota Highlander MAF Sensor (also known as Kluger in AU/NZ)

Yes, a MAF sensor is fitted and relevant on the 2004 Toyota Highlander. Toyota’s Repair Manual for this model (Engine Control System sections for the 2AZ‑FE 2.4L and 3MZ‑FE 3.3L) lists a “Mass Air Flow Meter” as a primary ECM input. DENSO catalogues for the period show direct-fit MAF meters for both engines (commonly cross-referenced to Toyota part numbers such as 22204‑0D030 and 22204‑22010), further confirming factory fitment.

The MAF sensor measures the actual mass of air entering the engine so the ECU can deliver the right amount of fuel, keep mixtures tidy, and maintain smooth drivability. On the 2004 Highlander/Kluger, it’s a hot‑wire style meter mounted just downstream of the air filter box, and it also incorporates the intake air temperature sensor. When it’s working properly, cold starts are crisp, fuel economy stays on track, and throttle response feels clean across town and on the open road.

Because it sits right in the intake stream, the MAF can get coated with dust, oil vapour, or residue from oiled aftermarket filters. That grime skews readings and can trigger symptoms like rough idle, flat spots, sluggish performance, or a glowing check engine light (common codes include P0101–P0103 and lean codes like P0171/P0174 if unmetered air sneaks in). Before throwing parts at it, it’s worth a clean and a quick check for intake leaks.

Good servicing practice on a 2004 Highlander is to inspect the air filter and MAF every 40,000–60,000 km, sooner if driven on dusty roads. Use only a dedicated MAF cleaner—never carb or brake cleaner—and avoid touching the sensing element. If the sensor has failed electrically or cleaning doesn’t settle the trims, replace it with a quality DENSO/OE‑spec unit. After refit, clear fault codes and let the ECU relearn idle (a few minutes of warm idle and a short drive usually does it).

DIY swap is straightforward:

• Ignition off, key out, engine cool.
• Unplug the harness and undo the two screws.
• Lift the sensor, check the O‑ring, and seat the new unit in the correct orientation (flow arrow towards the engine).
• Reconnect, ensure the intake clamps are snug, and verify there are no vacuum leaks.

Look after the air filter, keep the intake sealed, and the Highlander’s MAF will go the distance without fuss.

Popular questions about 2004 Toyota Highlander MAF sensors

Where is the MAF sensor located on a 2004 Highlander?
It sits on the air intake tube immediately after the air filter box, held by two screws with a multi‑pin electrical connector. If you’re looking under the bonnet, follow the airbox outlet towards the throttle body—you’ll spot the sensor housing in-line.

Can a MAF sensor be cleaned or should it just be replaced?
Often a careful clean with a dedicated MAF cleaner restores normal readings, especially if the issue is contamination rather than an electrical fault. If cleaning doesn’t help or the sensor fails tests, replace it with an OE‑quality unit. Avoid harsh solvents and never touch the sensing wire.

Do both the 2.4L and 3.3L engines use the same MAF?
Both engines use a DENSO hot‑wire MAF, but part numbers can differ. Always match by VIN or use the OE part number on your original sensor to ensure the correct calibration and connector style.