Parts for your 2013 Mazda Premacy-Camshaft sensor

2013 Mazda Premacy camshaft sensor — what it does and how to look after it

Based on Mazda technical publications for the CW-series Premacy/Mazda5 (workshop manual sections covering the Camshaft Position [CMP] Sensor, engine control, and DTC diagnostics such as P0340/P0341), as well as Mazda Electronic Parts Catalogue listings for the LF-VD 2.0 petrol, L5-VE 2.5 petrol, and 1.6 MZ-CD/DV6 diesel engines used in this model year, the 2013 Mazda Premacy is fitted with a camshaft position sensor.

The camshaft sensor on a 2013 Mazda Premacy is a small but critical piece of the engine management puzzle. It tells the ECU exactly where the camshaft sits in its rotation, letting the car time sequential fuel injection, coil firing, variable valve timing, and smooth i-stop or hot restarts. Without a clean cam signal, the Premacy can crank for ages, stumble, run rich, or drop into limp mode to protect itself.

There’s no regular service interval for the sensor itself, but good oil and filter changes go a long way, because varnish and blow-by can migrate to the sensor tip over high kilometres. During routine servicing, it’s worth casting an eye over the sensor connector and wiring for heat-hardening, oil wicking, or chafe near the head and timing cover.

Common clues it’s time to test or replace the cam sensor include:

• Hard starting when hot, rough idle, misfire, or random stalling
• Poor fuel economy and lazy throttle response
• Check Engine Light with codes like P0340 or P0341

Replacement is straightforward with basic tools. Under the bonnet, pop off the engine cover, unplug the sensor at the cylinder head (typically on the intake side near the timing cover on petrol variants, on the diesel it’s at the rear of the head), remove the retaining bolt, and ease the sensor out. Lightly oil the O-ring on the new unit, seat it squarely, and refit the bolt to about 8–10 N·m. Reconnect, clear codes, and let the ECU relearn during a normal drive. There’s usually no special programming required.

Pro tips: choose a genuine or high-quality OEM sensor, fix any oil leaks that could contaminate connectors, and inspect the harness routing while you’re there. If symptoms persist after replacement, check the timing chain alignment and the cam trigger wheel, as a worn chain or damaged reluctor can mimic a failing sensor.

Popular questions

Where is the camshaft sensor on a 2013 Mazda Premacy?
It’s mounted on the cylinder head. On most petrol variants it sits on the intake side near the upper timing cover, under the plastic engine cover. On the 1.6 diesel it’s typically at the rear of the head. A torch and a small ratchet make life easier.

Look for a single small retaining bolt and a two- or three-pin connector. Always disconnect the battery negative terminal if you’re unplugging engine sensors.

Can you drive with a failing camshaft sensor?
Sometimes, but it’s not wise. The ECU may fall back to a default strategy, which can mean rough running, higher fuel use, and unexpected stalling. On a bad day it may not start at all when hot.

If the dash throws P0340/P0341 or the Premacy starts playing up, get it tested and sorted before a longer trip. It’s an inexpensive fix compared with the hassle of a roadside drama.

Does a new camshaft sensor need coding?
On the 2013 Premacy, no special coding is normally required. Fit the sensor, clear any fault codes, and take a short drive for the ECU to relearn cam/crank correlation.

If codes return, check wiring integrity, oil contamination at the connector, and mechanical timing. A stretched chain or damaged trigger wheel can confuse a brand-new sensor.