Parts for your 2009 Mitsubishi Lancer-Camshaft sensor

2009 Mitsubishi Lancer Camshaft Sensor: Purpose, tips, and when to replace

Based on the Mitsubishi CJ Lancer workshop manual (2007–2013), plus industry references like Autodata and Haynes/Alldata engine management guides, the 2009 Mitsubishi Lancer is fitted with a camshaft position sensor (often called a CMP). All common 2009 Lancer engines — 1.5L 4A91, 2.0L 4B11, 2.4L 4B12 and the turbocharged 4B11T — use a CMP to enable sequential fuel injection and MIVEC variable valve timing. Some variants use one CMP, others use two (one per cam).

The camshaft sensor tells the engine control module exactly where the cam(s) are in relation to the crank. That timing info lets the ECU fire injectors and spark at the right moment and advance/retard the cams for power, economy, and lower emissions. If the CMP signal drops out, the Lancer may crank longer, run rough, log a fault like P0340/P0341, or drop into a basic “limp” strategy that feels flat and thirsty.

As a rule, the camshaft sensor isn’t a scheduled service item. It’s checked and replaced on condition. During routine servicing, it’s smart to:

• Scan for stored or pending codes and look at cam/crank correlation data.
• Inspect the sensor connector and loom near the cylinder head for heat or oil damage.
• Keep an eye out for rocker cover leaks that can wick oil into the plug.

If replacement’s needed, it’s a straightforward job for most workshops. The sensor is mounted on the cylinder head at the timing chain/belt end, on some engines there’s one for intake and one for exhaust. Tips that help:

• Use a quality OEM-equivalent sensor and a fresh O-ring if applicable.
• Disconnect the battery, keep the sensor tip clean, and avoid forcing the connector latch.
• Clear codes and perform a road test to confirm proper cam/crank sync and MIVEC operation.

Common symptoms that point to a tired CMP on a 2009 Lancer include hard starting when hot, intermittent stalling at idle, hesitant take-off, poor fuel economy, and the MIL light with P0340/P0341. Because similar symptoms can be caused by wiring faults or crank sensors, proper diagnosis beats guesswork every time.

FAQs

Does a 2009 Mitsubishi Lancer have a camshaft sensor?
Yes. According to Mitsubishi’s CJ Lancer service documentation and mainstream repair data sources, all 2009 Lancer engines use at least one camshaft position sensor to manage sequential injection and MIVEC timing.

What are the signs a Lancer camshaft sensor is failing?
Typical clues include hard starting, misfires, rough idle, poor fuel economy, flat performance, and a check engine light with codes like P0340 or P0341. Wiring damage or oil intruding into the connector can mimic a bad sensor, so a proper scan and inspection are essential.

Should the camshaft sensor be changed as part of regular servicing?
No. It’s not a routine replacement item. It should be inspected during service and replaced only if fault codes, test results, or physical damage point to a problem.