Parts for your 2006 Toyota Highlander-Map sensor

2006 Toyota Highlander MAP sensor — what it does and how to look after it

Based on Toyota’s service information (TIS) for the 2006 Highlander (Engine Control – SFI), the intake manifold pressure (MAP) sensor is fitted to both the 2.4‑litre 2AZ‑FE and 3.3‑litre 3MZ‑FE engines, including the Hybrid. The Toyota Electronic Parts Catalogue and common aftermarket listings from OE suppliers such as DENSO also show a MAP sensor application for this model year. OBD‑II diagnostics for this vehicle family include MAP‑related DTCs (P0106–P0108), further confirming its use.

On this Highlander, the MAP sensor reads the vacuum/pressure inside the intake manifold so the ECU can judge engine load. It often works alongside the MAF sensor: the MAF tracks air mass coming in, while the MAP validates load, sharp throttle changes, and altitude. That accuracy helps the Highlander settle into a smooth idle, deliver decent fuel economy on long Kiwi and Aussie kilometres, and keep emissions in check.

There’s no scheduled replacement for the MAP sensor, but it benefits from a quick look during regular servicing. Under the bonnet, check the sensor’s electrical connector for corrosion, make sure the O‑ring is intact, and confirm any short vacuum stub or port isn’t clogged with oily residue. If cleaning is needed, use electronics‑safe cleaner only—never soak it or poke the port with wire. When the throttle body is removed for cleaning, it’s a good time to inspect the MAP nearby.

• Common symptoms of a dodgy MAP: hard starting, rough idle, flat spots on take‑off, increased fuel use, sooty exhaust, and the check engine light.
• Typical fault codes: P0106 (range/performance), P0107 (low input), P0108 (high input).

Quick driveway checks help. With a scan tool, key‑on/engine‑off should read roughly local barometric pressure (around 100 kPa at sea level). At warm idle, expect notably lower pressure (high vacuum). If figures don’t stack up and there are no vacuum leaks, the sensor may be on the way out.

Replacing it is straightforward: disconnect the battery’s negative terminal, unplug the connector, remove the retaining screw(s), swap the O‑ring if supplied, and refit. Light spanner torque only—just snug. Clear any codes and take the Highlander for a short relearn drive. If problems persist, check for intake leaks or wiring issues before ordering more parts.

Where is the MAP sensor on a 2006 Highlander?

It’s mounted on the intake manifold, close to the throttle body. On the four‑cylinder it typically sits on the top or side of the plenum, on the V6 it’s positioned near the front bank intake runner area. A small electrical connector and a single or twin screw mount give it away under the bonnet.

What codes point to a bad MAP sensor on this model?

Look for P0106 (MAP/Baro range‑performance), P0107 (circuit low), and P0108 (circuit high). Before blaming the sensor, rule out vacuum leaks, split hoses, oil contamination in the port, and wiring faults—those can trigger the same codes on a perfectly good sensor.

Can it be driven with the MAP sensor unplugged?

The ECU may limp on backup values, but driveability and fuel economy will suffer, and it risks catalyst damage over time. Best practice is to diagnose and fix the issue promptly rather than driving around with the sensor disconnected.