Quick answer: Engine Air Filter Replacement on a 1991–1995 Toyota MR2 is rated Easy and takes about 15 minutes. You'll need 1 tool for this job, and parts cost about $35. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| Engine air filter for 1991-1995 Toyota MR2; verify engine, housing shape, and VIN fitment |
— |
$35.00 |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Open the rear decklid — the airbox is behind the cabin
Engine off, release the rear decklid. The mid-engined SW20's air filter is in the rear compartment, in a rectangular black housing on the driver's side. Let the bay cool thoroughly — enclosed compartments hold heat far longer.
🔧 Mechanic's note — Tom Becker
These bays stay hot — I've burned a forearm reaching in too soon. Give it real time, especially if it's a turbo car.
2
Clean the lid seam and release its clips or screws
Wipe dust off the airbox lid and seam so grit can't fall in. Clips or screws hold the lid depending on year — release every fastener. The 30-year-old plastic is brittle: work gently and never lever the lid.
🔧 Mechanic's note — Tom Becker
I keep a magnet tray right next to me on these — those tiny screws love to vanish into the engine bay forever.
3
Lift the lid and identify the airflow meter on turbo cars
Lift the lid straight up and set it aside on a rag. On the 2.0L turbo (3S-GTE), the intake tube holds a vane-type airflow meter — do not poke the vane flap or touch the sensor element. The 2.2L (5S-FE) has no such sensor.
🔧 Mechanic's note — Tom Becker
That vane flap is fragile and expensive to replace — I've seen one jabbed with a screwdriver and the car never idled right after. Hands off.
4
Remove the old filter and note its orientation
Lift the old filter out and note its orientation — which face was up and how the frame sat in the channel. Heat cycling can leave the old rubber frame stuck to the box; peel it up carefully.
5
Clean the box, minding the side-vent debris
Vacuum or wipe out the lower box half, clearing the leaves and grit from the side intake vent. Check the clean-side outlet for foreign objects. Do not blow compressed air toward the intake tube — you'll drive dust deeper.
6
Seat the new filter and refit the lid gently
Lower the new filter into the box in the same orientation as the old one, pressing the frame down until it sits flat. Set the lid back on squarely and refasten every clip or screw — snug only; overtightening cracks the bosses.
7
Verify the seal and test-drive
Confirm all clips are latched or screws snug and the snorkel is still connected. Start the engine and idle about a minute, listening for hissing. Take a short drive to confirm normal boost (turbo) or throttle response (2.2L) with no check-engine light.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Looking for the airbox under the front hood — on the mid-engine MR2 everything intake-related lives behind the cabin, under the rear decklid.
- • Forcing the lid off without releasing all of its clips or screws, cracking the brittle 30-year-old plastic.
- • On turbo models, poking at the vane-type airflow meter in the intake tube; its flap and sensor do not tolerate handling.
