Parts for your 2008 Mazda Premacy-Camshaft sensor

2008 Mazda Premacy Camshaft Position Sensor (CMP)

Based on Mazda’s own technical literature, a camshaft position sensor is fitted to the 2008 Mazda Premacy (CR platform). The Mazda 5/Premacy (CR) Workshop Manual under “Engine Control System – Camshaft Position (CMP) Sensor,” the Mazda Service Information (MSI) library, and Mazda’s Electronic Parts Catalogue for the LF-DE 2.0 petrol, L3-VE 2.3 petrol, and RF 2.0 diesel engines all specify a CMP sensor mounted at the cylinder head. These sources confirm the CMP sensor is relevant and used for sequential fuel injection, ignition timing, and variable valve timing (S-VT) control on this model.

On the 2008 Premacy, the camshaft sensor is a small but crucial bit of kit. It reads a trigger on the camshaft and feeds the ECU exact valve timing info, so spark and fuel land at the right moment and the S-VT can do its thing. When it’s healthy, starts are crisp, idle is smooth, and the engine pulls cleanly across the rev range. When it’s crook, expect hard starting, a rough idle, flat spots, and a glowing check engine light. Common fault codes include P0340 and P0341, and sometimes cam/crank correlation or VVT range codes if timing control goes out of whack.

As part of regular servicing, it’s worth a look under the bonnet to give the CMP sensor area a once-over. On these Mazdas the sensor lives at the cylinder head near the timing chain end. Oil weep from a rocker cover gasket can contaminate the connector, and heat can make the loom brittle over the years. A quick clean of the connector, a check for broken clips, and ensuring the O-ring isn’t leaking can save bigger hassles later. Many owners organise an inspection every 40–60,000 kilometres alongside plugs and filters.

Replacement is straightforward with basic tools. Disconnect the battery, unplug the connector, remove the retaining bolt, and pull the sensor straight out. Lightly oil a new O-ring, seat the new sensor squarely, and tighten the bolt to about 8–10 N·m with a small torque wrench. Use a quality part—genuine Mazda or a reputable OEM like Denso—to avoid false triggers. There’s no special programming required on this platform, clear the codes, start the engine, and go for a short road test. If a code returns, double-check the connector, wiring, and, if needed, confirm timing-chain health and cam phasing with workshop data before throwing more parts at it.

Popular questions

1. Where is the camshaft sensor on a 2008 Mazda Premacy?

   It’s mounted on the cylinder head at the timing chain end. Look down the side of the rocker cover near the front of the engine, you’ll see a small sensor secured by a single bolt with a two‑pin or three‑pin connector. Access is typically from the top with the engine cover off.

2. What fault codes point to a bad camshaft sensor on this model?

   P0340 (Camshaft Position Circuit) and P0341 (Camshaft Position Performance/Range) are the usual suspects. You might also see cam/crank correlation or VVT range codes if the signal is intermittent or timing can’t be controlled properly. Always check wiring and oil contamination before condemning the sensor.

3. Does the ECU need programming after replacing the camshaft sensor?

   No reprogramming is generally required. Fit the new sensor, clear any stored codes, and perform a short drive cycle. If the idle’s a touch uneven at first, the ECU will typically relearn trims quickly. Persistent faults suggest wiring issues or mechanical timing concerns.