Parts for your 2018 Mitsubishi Asx-Camshaft sensor

2018 Mitsubishi ASX camshaft sensor: what it does and when to service it

Technical sources confirm the 2018 Mitsubishi ASX is fitted with a camshaft position sensor (CMP). The Mitsubishi Motors factory service manual for RVR/ASX/Outlander Sport (2018, Engine Electrical) details CMP operation and diagnostics, including DTCs P0340 and P0341. The Mitsubishi ASA global parts catalogue lists a camshaft position sensor for GA-series ASX models with 4B11 2.0L, 4A92 1.6L petrol, and 4N13 diesel engines. Major aftermarket catalogues from recognised brands also list direct-fit CMP sensors for this model. That makes the camshaft sensor absolutely relevant on the 2018 ASX.

On the 2018 Mitsubishi ASX, the camshaft position sensor keeps the engine’s timing in sync. It reports the exact position of the cam(s) to the ECU, so fuel injection and spark happen at the right moment for smooth idle and economy. On MIVEC petrol engines, it also lets the computer shift cam timing on the fly, delivering torque down low and better pull. Without a good signal, the ECU can’t run true sequential injection, so it may default to a backup mode that saps power and can bump up emissions. That’s why a healthy sensor is a small part with a big job.

• Check Engine light with P0340 or P0341 stored.
• Hard starting, extended cranking, or random stalling.
• Rough idle, flat spots, or poor fuel economy.
• Noticeable loss of power and MIVEC not engaging.
• Tachometer flicker or misfire that won’t trace elsewhere.

Unlike filters or plugs, the cam sensor isn’t a scheduled replacement item. They usually last years, but heat, oil intrusion, or wiring damage can take one out. If the lamp’s on, scan it, and check live data for a clean, steady cam signal that tracks engine speed. Under the bonnet, inspect the connector for corrosion or loose terminals, and follow the loom for rub-through near brackets. A light mist of engine oil around the sensor flange can point to a tired O-ring, replace that seal whenever the sensor is removed. The sensor itself is non-adjustable: if it’s failed, fit a quality OE or reputable aftermarket unit, click the connector home, tidy the loom, clear codes.

If symptoms persist after replacement, don’t ignore the crankshaft sensor or timing issues, the two signals must agree. On high‑kilometre ASX vehicles, brittle wiring near the timing cover is a common culprit. Keep the sensor tip clean and away from metal filings, never force it into the bore, and always fit the correct O-ring. There’s no relearn needed on most ASX variants, but a short drive with varied speeds helps the ECU settle. A quick once-over of the plug and loom at oil filter or belt services can save hassle down the track.

Where is the camshaft sensor on a 2018 Mitsubishi ASX?

It’s mounted on the cylinder head near the camshaft sprocket, typically under the plastic engine cover. On popular petrol MIVEC engines, it’s usually at the intake cam end. Diesel variants may place the sensor differently but still at the head, close to the cam gear or cover.

How long does a camshaft sensor last on the ASX?

There’s no fixed interval, many last the life of the vehicle. Heat, oil contamination, and wiring stress are the usual reasons they fail. If a fault code appears or symptoms match a weak sensor, testing and timely replacement prevents poor performance and hard-start headaches.

Can the ASX run with a failed camshaft sensor?

Sometimes it will start and run in a reduced “fallback” mode using the crank sensor, but performance, economy, and driveability suffer. In other cases it may crank for ages or not start at all. Sorting the CMP fault restores proper timing control and MIVEC operation.