Parts for your 2019 Toyota Mark x-Map sensor

2019 Toyota Mark X MAP sensor — what it does and when to service it

Referencing Toyota technical sources, the 2019 Toyota Mark X is fitted with a MAP (manifold absolute pressure) sensor. The Toyota Repair Manual for GRX130/GRX133 (Engine Control – SFI System for 4GR‑FSE and 2GR‑FSE) details MAP sensor operation and diagnostics (including DTCs P0106, P0107, P0108), and the Toyota Electronic Parts Catalogue for the 2019 Mark X lists a Manifold Absolute Pressure sensor on the intake manifold. Toyota’s Electrical Wiring Diagram for these engines also shows the MAP circuit (VC, PIM, E2) to the ECM. So, yes—this part is relevant on the 2019 Mark X.

On the 2019 Mark X, the MAP sensor reads the air pressure inside the intake manifold, letting the ECM figure out real engine load alongside the MAF sensor. That data helps the car fine‑tune fuel delivery for the D‑4S injection system, manage ignition timing, handle altitude changes, and keep emissions systems like EGR and EVAP behaving. It also serves as a handy backup signal if the MAF has a wobble.

As for service, the MAP sensor isn’t a regular replacement item, but it pays to keep an eye on it during scheduled maintenance. Tell‑tales of a grumpy MAP include rough idle, flat spots, heavy fuel use, hard starts, or the check engine light with codes like P0106–P0108. Under the bonnet, it’s mounted on the intake manifold, it uses a small O‑ring seal and a simple electrical connector.

Good workshop habits go a long way:

• Check the connector and harness for corrosion, oil soak, or a loose fit.
• Make sure the PCV system isn’t flooding the intake with oil vapour.
• Scan live data: at key‑on/engine‑off you’ll typically see near local barometric pressure, at warm idle, expect a lower kPa reading (high vacuum).
• Avoid blasting the sensor with harsh cleaners, if contamination is visible, a light mist of electronics‑safe cleaner on the port is the go. Let it dry fully.

If replacement’s needed, it’s a straightforward swap: disconnect the plug, remove the retaining fastener, ease out the sensor, fit a fresh O‑ring if required, and refit. Clear any fault codes, then take a short drive so the ECM relearns trims. Pairing MAP checks with throttle body and intake inspections at major services keeps the Mark X running sweet over the long kilometres.

Popular questions

Does the 2019 Toyota Mark X have both a MAF and a MAP sensor?
Yes. The Mark X uses a MAF up‑stream to measure incoming air and a MAP on the intake manifold to read manifold pressure. The ECM blends both signals for accurate load calculation, backup in fault scenarios, and smoother fuelling and timing across conditions.

What fault codes point to a MAP sensor issue on a 2019 Mark X?
Common codes are P0106 (range/performance), P0107 (low input), and P0108 (high input). These can be caused by wiring issues, vacuum leaks, contamination, or a failed sensor, so always check for intake leaks and connector condition before condemning the part.

How often should the MAP sensor be cleaned or replaced?
There’s no fixed interval. Inspect it during routine services, especially if drivability changes or a CEL appears. Clean only if contamination is present and replace if readings are implausible, faults return, or the O‑ring can’t seal properly.