Parts for your 2009 Honda Stream-Camshaft sensor

2009 Honda Stream camshaft sensor — what it does and when to replace it

Technical sources confirm the 2009 Honda Stream is fitted with a camshaft position sensor (CMP). The Honda Stream RN6–RN9 Service Manual (PGM-FI section) specifies a CMP sensor for the R18A/R20A i-VTEC engines, and Honda’s electronic parts catalogues list the component (commonly referenced as “Sensor Assy., Cam Position (CMP)” with typical OE part numbers such as 37510-RNA-A01 for R18A and 37510-R40-A01 for R20A). Standard OBD-II diagnostics for these engines also include CMP-related DTCs (e.g., P0340, P0341), underscoring that the sensor is integral to engine management.

On a 2009 Honda Stream, the camshaft sensor is a small, solid-state unit that reads the cam’s position as it rotates. Working alongside the crankshaft sensor, it gives the ECU the timing reference needed for sequential fuel injection, precise ignition timing, and i-VTEC control. That accuracy helps cold starts, smooth idle, decent fuel economy, and lower emissions — all the good stuff owners expect from a well-sorted Honda.

It’s not a scheduled replacement item, but a quick check during regular servicing is smart. Under the bonnet, look for oil weeping around the sensor’s O-ring, a brittle or oil-soaked connector, or chafed wiring near the timing chain end of the head. Keep the plug clean and seated, avoid blasting the area with a pressure washer. If the Check Engine light pops up with a code like P0340 or P0341, scan it, inspect the wiring, and only then call the sensor suspect.

• Typical symptoms of a failing CMP: hard starting, intermittent stalling, rough running, poor fuel economy, and a lit MIL.
• A healthy Stream will show stable idle and clean transitions as VTEC engages, with no misfire codes tied to cam signal loss.

Replacement is straightforward for a competent DIYer or any workshop. Disconnect the battery, remove the engine cover, unplug the 3‑pin connector, undo the single retaining bolt, then twist and pull the sensor free. Fit a new O‑ring, lightly oil it, seat the new sensor, tighten the bolt to factory spec, reconnect, clear codes, and road test. Using a genuine Honda part or a reputable aftermarket equivalent that matches OE spec is worth it — cheap copies can throw erratic signals and waste time.

Pro tip for Aussie and Kiwi owners racking up the kilometres: timely oil changes with the correct grade help keep varnish and heat stress in check, which is kinder to sensors and connectors. Also ensure harness clips are intact so the loom doesn’t rub through near the cam cover.

FAQs

Where is the camshaft sensor on a 2009 Honda Stream?
It’s mounted on the cylinder head at the timing chain end, near the top of the engine. Look for a small sensor with a single bolt and a 3‑pin connector, accessible once the engine cover is off.

What are the signs the camshaft sensor is failing?
Hard starts, random stalling, rough idle, sluggish performance, poor economy, and a Check Engine light with codes like P0340/P0341. Sometimes it behaves intermittently as heat builds up.

Does the camshaft sensor need regular replacement or calibration?
No scheduled replacement or calibration is required. Replace it if faults are confirmed after proper diagnosis, and always check the wiring and O‑ring for issues first.