Parts for your 2003 Honda Stream-Camshaft sensor

2003 Honda Stream camshaft sensor — purpose, fitment, and service advice

Based on Honda technical literature for the Stream RN1–RN5 series (2000–2006), a camshaft position sensor (CMP) is fitted and used on the 2003 Honda Stream. The RN3/RN4 K20A i‑VTEC engines show a CMP on the intake cam for VTC control in Honda factory service manuals and wiring diagrams, and some variants also carry an exhaust-side sensor. The RN1/RN2 D17A engines list a CMP/CYP input for sequential fuel injection and misfire detection. Common OBD‑II fault coverage for this model includes P0340/P0341 CMP circuit codes, further confirming its relevance on this vehicle.

On the 2003 Stream, the camshaft sensor tells the ECU exactly where the cam is in its rotation. That timing info lets the ECU fire the injectors in sequence, stabilise idle, manage ignition, and on K‑series i‑VTEC engines, command the cam phaser for smoother torque and better fuel economy. If the sensor goes out of whack, the Stream can be hard to start, run rough, hesitate under load, drop into a limp strategy, or throw the Check Engine lamp.

There’s not much “maintenance” for the CMP itself, but clean, regular oil changes are a quiet hero here, especially on K‑series with cam phasing—grubby oil can upset timing behaviour and confuse the ECU’s correlation checks. During servicing, a quick look for oil wicking into the sensor plug, cracked wiring, or a weeping O‑ring is worthwhile. Keeping the connector pins clean and the harness properly clipped under the bonnet helps prevent intermittent faults.

• Typical symptoms of a tired CMP: longer cranking, uneven idle, poor fuel economy, flat spots, and fault codes like P0340/P0341.
• Basic replacement pointers: relieve battery power, unplug the connector, remove the single retaining bolt, swap the sensor and O‑ring, then refit and torque the bolt (Honda workshop data typically cites around 9–12 N·m depending on engine). Clear codes and road‑test.
• Location: on K20A, the intake cam end at the timing chain side (some variants have an exhaust‑side sensor too). On D17A, the CMP/CYP pickup is mounted at the cam end per Honda wiring diagrams.

Genuine or high‑quality aftermarket sensors tend to give the best long‑term result. If the Stream logs a CMP code, always check the timing (especially after recent belt/chain or rocker cover work), the engine earths, and the loom before condemning the sensor. Getting those basics right saves a lot of mucking about.

Does a 2003 Honda Stream have a camshaft sensor?

Yes. Both the D17A and K20A Stream engines use a CMP input. On K‑series i‑VTEC it’s essential for cam phasing, on D‑series it’s key for sequential injection and misfire monitoring.

Where is the camshaft sensor on a 2003 Stream?

On K20A models it’s at the timing chain end on the intake cam cover (some variants also have an exhaust‑side sensor). On D17A, the CMP/CYP pickup is mounted at the cam end as shown in Honda service diagrams.

When should the camshaft sensor be replaced?

There’s no fixed kilometre interval. Replace it if there are CMP‑related fault codes, clear wiring and connector checks, verified power/ground/signal integrity, and timing is correct. Always use a new O‑ring and the proper bolt torque.