2010 Lexus RX350 Cabin & Engine Air Filter Replacement (5 Minutes, $16)

If your 2010 Lexus RX350 smells musty, the AC airflow feels weak, or you just want better gas mileage and cleaner cabin air, the two filters to check first are the cabin air filter and the engine air filter. Both are easy to reach, neither needs a single tool, and the parts run about $16 for the pair — versus the $70–$120 a dealer will charge to do the exact same swap.

Here’s how to do both in about five minutes.

Part 1 — Cabin air filter (the slightly trickier one)

The cabin filter sits behind the glove box.

1. Empty the glove box so it’s light.
2. Release the glove box. Reach your hand under the left side of the box and pull straight up — the whole glove box pops out. (Don’t force it from another angle; that’s how the tabs snap.)
3. Open the filter flap. Behind the glove box you’ll see a flap with a small tab on each side. Pull up on both tabs and the cover comes off, revealing the filter.
4. Pull the old filter out and note its orientation — the felt edge faces a specific way, so look before you yank.
5. Check airflow direction. Many aftermarket filters don’t print an arrow. To be sure, turn the ignition on (engine off is fine), set the fan running, and hold a small piece of paper near the opening. On the RX350 the air pulls downward — so the filter’s arrow should point down. (Careful, the blower is spinning.)
6. Slide the new filter in, replace the cover (it seats in, then down), and clip the glove box back in — right clip first, then press the left side down.

Reality check: after just one year the old cabin filter in the video was filthier than expected. This is a once-a-year job at minimum.

Part 2 — Engine air filter (the easy one)

The engine filter is under a cover in the engine bay held by a few clips.

1. Pop the clips. There are four small clips on the air box cover. Peel them off — they’re cheap plastic and easy to break, but replacements are pennies.
2. Lift the cover off. It slides straight off to reveal the engine air filter.
3. Release the filter. Two small clips hold it; pull it down and out.
4. Compare old vs. new. Even a “not too bad” filter is visibly dirtier than a fresh one — another reason this is an annual swap.
5. Drop the new filter in. It only fits one way. Seat it, slide the cover back on, and snap the four clips home. Done.

That’s it

Two filters, five minutes, about sixteen dollars, zero tools. The exact filters used are linked in the parts box above — the cabin filter is the carbon-activated version, which does a noticeably better job killing odors than the plain OEM paper filter.