Parts for your 1999 Mitsubishi Lancer-Camshaft sensor

1999 Mitsubishi Lancer camshaft sensor — fitment, purpose, and service tips

Technical documentation confirms the 1999 Mitsubishi Lancer does use a camshaft position sensor (CMP). On the common AU/NZ CE-series engines (4G15 1.5L and 4G93 1.8L), the CMP is integrated inside the distributor as a cam/crank angle sensor assembly, on some DOHC/GDI variants, it’s a separate sensor mounted at the cylinder head. This is detailed in the Mitsubishi CE Lancer/Mirage Workshop Manual (Engine Electrical, 1996–2003), Autodata technical and wiring references for AU/NZ, and Haynes Mitsubishi Mirage & Lancer manuals covering 1997–2002, all of which show a CMP signal fed to the ECU for ignition and fuel control.

The camshaft sensor’s job is to tell the ECU exactly where the camshaft (and therefore each cylinder’s valve timing) is at any moment. That timing data lets the ECU fire the injectors in the right order and clean up cold starts, idle quality, and fuel economy. On CE models with a distributor, the “cam” signal is generated inside the distributor body, it’s essential to spark timing, so when it goes on the fritz the Lancer can be hard to start, run rough, or not run at all.

There’s no fixed service interval for the sensor, but it deserves a look whenever the bonnet’s up for routine servicing. Common clues it’s crook include hard starting, random stalling, misfires, poor fuel use, and a check engine light with codes like P0340 or P0341. Oil contamination inside the distributor, a brittle connector, or chafed loom near the rocker cover are frequent culprits.

Replacement advice depends on engine type. For distributor-equipped 4G15/4G93 cars, many workshops replace the distributor assembly as a unit, as the internal sensor isn’t always sold separately. A competent tech will:

• Disconnect the battery and note the distributor’s position to preserve base timing.
• Inspect and replace the O-ring to prevent oil leaks.
• Refit, set base timing as per factory spec, clear codes, and check idle learn.

On DOHC engines with an external CMP at the cam cover, it’s a quicker swap: unplug, remove the retaining fastener, replace the sensor and seal, then verify the signal on a scan tool.

Workshop tips that save headaches:

• Use quality parts, cheap sensors can drop signal when hot.
• Clean and tension the connector pins, a dab of dielectric grease helps in wet Kiwi and coastal Aussie conditions.
• If a new sensor doesn’t fix it, scope the crank sensor and check timing belt alignment—one tooth out can mimic a bad CMP.

Done right, a healthy cam sensor keeps the 1999 Lancer starting first go, idling sweetly, and using less juice.

Where is the camshaft sensor on a 1999 Mitsubishi Lancer?

On most AU/NZ CE models with 4G15 or 4G93 engines, the camshaft signal is generated inside the distributor. On certain DOHC or GDI variants, the sensor is a separate unit mounted at the cylinder head near the camshaft sprocket or rocker cover.

What are the symptoms and fault codes of a failing camshaft sensor?

Hard starting, extended cranking, random stalling, rough idle, and poor fuel economy are common. The check engine light often stores P0340 or P0341. Intermittent faults can be heat-related and show up after a warm soak.

Should the camshaft sensor be replaced as preventive maintenance?

Not typically. It’s replaced on condition. As part of regular servicing, a quick inspection of the distributor (or external sensor), wiring loom, and connector is worthwhile—especially if there’s oil inside the distributor or the loom insulation looks tired.