Parts for your 2018 Toyota C-hr-Map sensor

2018 Toyota C-HR MAP Sensor — What It Does and How to Look After It

Yes, the 2018 Toyota C-HR is fitted with a MAP (Manifold Absolute Pressure) sensor. Technical sources confirm its use on both engine variants common to this model: Toyota’s service information (TIS) for the C-HR SFI system documents DTCs P0106, P0107 and P0108 for the “Manifold Absolute Pressure Sensor”, and the Toyota Electronic Parts Catalogue (EPC) lists a “Sensor, Manifold Absolute Pressure” for C-HR (AX10/AX50) with 8NR-FTS (1.2L turbo) and 3ZR-FAE (2.0L Valvematic) engines. The C-HR’s wiring diagrams also show a MAP sensor input to the ECM, which seals the deal.

On this model, the MAP sensor helps the engine computer figure out how much air is actually getting into the intake manifold. That lets the ECM nail the fuel delivery and ignition timing, keeps the idle smooth, and on turbo 8NR-FTS models it also tracks boost so the car doesn’t over- or under-boost. Even the 2.0L Valvematic setup uses MAP for load calculation, altitude correction and as a fallback to the MAF if required.

It’s not a routine service item, but it is worth a look whenever the C-HR is in for a major service or if there’s a check engine light with rough idle, flat spots, poor fuel economy, or black smoke. The sensor lives on the intake manifold (near the throttle body on the 2.0L) and on turbo cars you’ll typically find a pressure sensor on the manifold and may see an additional charge pipe sensor. Keep the vacuum port clear and avoid oil mist contamination from over-oiled aftermarket filters.

• Common signs of a crook MAP sensor: hesitation on take-off, high fuel use, surging, hard starts, and codes P0106/P0107/P0108 (and boost-related codes on the 1.2T).
• Basic care: don’t spray harsh cleaners into the sensor, if there’s muck, remove it and gently clean the port only. Check the connector for green corrosion and broken wires.
• Replacement tips: stick with a quality OEM-equivalent sensor, fit a new O-ring, ignition off before unplugging, and make sure the locating tab seats properly. Clear codes and take it for a drive so the ECM can relearn trims.

Most owners in Australia and New Zealand won’t ever need to replace the MAP sensor, but when symptoms pop up, sorting it early keeps the C-HR driving sweet and the fuel bill down.

Popular questions

Does the 2018 C-HR have both a MAP and a MAF sensor?
Yes. The C-HR uses a MAF at the airbox and a MAP on the intake manifold. Turbo 1.2L models also rely on manifold pressure for boost control and may have an additional charge-pressure sensor. The ECM blends these signals to manage fuelling and timing accurately.

How often should the MAP sensor be replaced?
There’s no set interval. It’s a “replace on condition” item. If there are drivability issues or codes pointing to the MAP, test it first. If the reading is out of range or the port is blocked and can’t be safely cleaned, replace it.

Where is the MAP sensor on a 2018 C-HR?
On the 2.0L Valvematic, it’s mounted on the intake manifold near the throttle body. On the 1.2L turbo, there’s a manifold-mounted sensor and, depending on spec, a charge pipe pressure sensor up-stream. Both are easy to spot under the bonnet by their 3-wire plug and small O-ring sealed body.