Parts for your 2004 Honda Fit-Camshaft sensor

2004 Honda Fit camshaft sensor: what it does and when to replace it

Based on Honda’s GD-series Workshop Manual (PGM‑FI section), the Honda Electronic Parts Catalogue, and Autodata wiring/engine management references, the 2004 Honda Fit (known as Jazz in Australia and New Zealand) is fitted with a camshaft position sensor. On the L‑series engines used in this model year, Honda often labels it the TDC or CMP sensor. It’s mounted on the cylinder head at the timing chain end and provides the engine control unit with precise cam phase information. So, yes—this part is relevant and used on the 2004 Honda Fit/Jazz.

The camshaft sensor’s main job is to keep the cam and crank in sync so the ECU can run accurate fuel injection and ignition timing. On i‑DSI and VTEC variants, that signal helps with crisp cold starts, smooth idle, clean emissions, and decent fuel economy. If the sensor signal drops out or goes noisy, drivers might see a check engine light (often codes like P0340/P0341), hard starting, rough running, hesitations, or higher fuel use. In some cases the car will still run using only the crank signal, but performance and drivability usually suffer.

Replacement is straightforward DIY for a confident home mechanic, but care matters. Typical steps:

• Disconnect the battery and let the engine cool.
• Locate the sensor on the cylinder head at the timing chain end, it’s held by a single small bolt with a 3‑pin plug.
• Unplug, remove the bolt, and gently twist the sensor out—mind the O‑ring.
• Lightly oil the new O‑ring, clean the mating face, refit, reconnect, and clear codes.

Tips from workshop practice: use an OEM‑quality sensor to avoid signal noise, inspect the connector for oil ingress or brittle wiring, replace the O‑ring if there’s any weep, and fix nearby rocker cover leaks so oil doesn’t foul the plug. There’s no special relearn—once fitted, the ECU will adapt. As part of routine servicing, a quick visual check of the sensor, harness, and any signs of oil contamination is a smart preventative step. If the engine’s racking up kilometres with intermittent stumbles or hard starts, scanning for related DTCs before the sensor fully fails can save a tow and some hassle.

Popular questions about the 2004 Honda Fit camshaft sensor

Where is the camshaft sensor on a 2004 Honda Fit (Jazz)?
On the GD‑series Fit/Jazz, it’s bolted to the cylinder head at the timing chain end, just behind the upper cover area. Look for a small sensor with a single bolt and a 3‑pin connector.

Can they drive with a bad camshaft sensor?
Sometimes the engine will start and run in a limited mode using only the crank signal, but it may be hard to start, run rough, or stall. It’s not recommended—get it diagnosed and replaced promptly.

Do i‑DSI models use a camshaft sensor?
Yes. Honda often calls it the TDC sensor on i‑DSI engines, but functionally it’s the camshaft position sensor providing cylinder identification and cam phase to the ECU.