Parts for your 2004 Honda Accord-Camshaft sensor

2004 Honda Accord camshaft sensor: what it does, where it is, and when to replace it

Yes, the 2004 Honda Accord is fitted with a camshaft position sensor (CMP). Technical sources that confirm this include the Honda Accord 2003–2007 Service Manual (Helm Inc.), which details CMP sensor operation and diagnostics for both the 2.4L i‑VTEC (K‑series) and 3.0L V6 (J‑series), the Honda electronic parts catalogue for the 2004 Accord, which lists a CMP sensor for the 2.4L and two CMP sensors (one per bank) for the 3.0L V6, and the Haynes Repair Manual for Honda Accord 2003–2012, which covers CMP testing and replacement procedures.

On this model, the camshaft sensor tells the engine control unit which stroke each cylinder is on so it can sync fuel injection and ignition timing precisely. It’s especially important for smooth cold starts, stable idle, clean emissions, and that crisp throttle response Accords are known for. The 2.4L engine uses one CMP sensor mounted on the cylinder head near the timing end under the bonnet. The 3.0L V6 uses two sensors, one on each bank, because there are two camshafts to track.

It isn’t a service item like oil or spark plugs, but it does live a tough life near heat and oil vapour. If the sensor or its O‑ring hardens, or the connector gets brittle, the car may log codes such as P0340/P0341, crank longer before starting, feel flat, or drop into limp mode. Before replacing the sensor, check the basics: clean the connector, inspect the harness for chafing, and make sure there’s no oil wicking into the plug.

When replacement is due, it’s a straightforward job with hand tools. Under the bonnet, disconnect the battery, unplug the sensor, remove its retaining bolt, and ease the sensor out—don’t lever hard against the alloy head. Lightly oil the new O‑ring, seat the new sensor squarely, and tighten the fastener to the specification in the Honda service manual. Clear any diagnostic trouble codes and verify a clean restart and steady idle. For the V6, diagnose which bank is affected rather than replacing both on a hunch.

To keep the CMP sensor happy over the long run:

• Stick to regular oil changes with the correct spec—clean oil helps keep the sensor face free of gunk.
• Inspect the connector and loom during services, especially if the vehicle has seen plenty of hot kilometres.
• If chasing intermittent faults, use live data to confirm cam/crank sync rather than guessing.

Popular questions about the 2004 Honda Accord camshaft sensor

Where is the camshaft sensor on a 2004 Honda Accord?
On the 2.4L i‑VTEC it’s on the cylinder head at the timing end, near the top of the engine. On the 3.0L V6 there’s one sensor on each cylinder head (Bank 1 and Bank 2), accessible from the front of the engine bay near the timing covers.

What are common symptoms of a failing camshaft sensor on this model?
Hard starting, rough idle, hesitation, poor fuel economy, and the check engine light with codes like P0340/P0341. Sometimes it’ll stall or go into a reduced‑power strategy. Wiring faults and oil intrusion at the connector can mimic a bad sensor, so inspect before replacing.

Should both camshaft sensors be replaced on the V6 at the same time?
Not necessarily. Use fault codes and live data to identify the affected bank. If one fails due to age or heat, the other may still be fine. It’s wise, however, to replace the O‑ring and address any harness brittleness you find on both sides.