Parts for your 2007 Honda Civic-Camshaft sensor

2007 Honda Civic camshaft sensor – purpose, care, and replacement

Yes, the 2007 Honda Civic uses a camshaft position sensor (often called a CMP sensor). Honda’s factory service information for the 2006–2011 Civic range (covering the 1.8-litre R18A and the 2.0-litre K-series in the Sport/Si) details CMP sensor diagnostics and wiring, and common OBD-II CMP fault codes (P0340-series). Reputable technical databases used in workshops (e.g., Autodata and Mitchell1 wiring and component locations) also show a CMP sensor for these engines. On the R18A there’s typically one CMP sensor, on the K20 performance variant, there are two (CMP A and CMP B) to monitor intake and exhaust cams.

The camshaft sensor tells the ECU exactly where the camshaft is in its rotation. That lets the Civic run true sequential fuel injection, nail spark timing, and smoothly control VTEC/VTC cam phasing. It’s especially important for clean cold starts, good fuel economy, and keeping emissions in check. If the signal goes wonky, the ECU can’t sync things properly, so you may see a check engine light, lazy throttle response, rough idle, or hard starting. On some models, the car may fall back to a safe “limp” strategy.

On a 2007 Honda Civic, the camshaft sensor isn’t a scheduled service item, so there’s no set replacement interval. The smart play during servicing is a quick visual: check the connector and harness for brittle insulation or oil contamination, and look for a weeping rocker cover gasket that can leak oil into the plug. Clean oil matters too—sludgy oil can upset the cam phaser behaviour and confuse the sensor, so stick to the correct spec and intervals.

If replacement’s needed, it’s usually straightforward: disconnect the battery, unplug the sensor, remove the retaining bolt, swap the sensor with a new O-ring lightly oiled, refit, and torque to the spec in the Honda manual. No special coding is typically required—clear any fault codes and let the ECU relearn. Use a quality OEM or reputable aftermarket part, cheap knock-offs can cause intermittent faults that’ll drive anyone spare. For K-series models with two sensors, label the connectors so CMP A and CMP B don’t get mixed up.

• Common signs of trouble: hard starting, rough idle, misfires, poor fuel economy, hesitations, and a check engine light with P0340–P0344 style codes.
• Good habits: keep connectors clean and secure, fix oil leaks promptly, and maintain proper oil quality and level.

Popular questions about 2007 Honda Civic camshaft sensors

Where is the camshaft sensor on a 2007 Civic?
On the 1.8-litre R18A, it’s mounted at the timing chain end of the cylinder head. On K-series two-cam models, you’ll typically find one sensor for the intake cam and one for the exhaust cam, both on the cylinder head near the timing chain end. It’s an easy visual once the engine cover is off.

Does the camshaft sensor need routine replacement?
No. There’s no fixed interval. Replace it only if it’s faulty or damaged. During regular servicing, a quick check of the plug, wiring, and nearby gaskets is all that’s needed. If you’re chasing a rough idle or hard starts with a check engine light, scan for CMP-related fault codes before buying parts.

Can a bad camshaft sensor cause a no-start?
It can. The ECU relies on a clean cam signal for sync, especially during cranking. A completely failed sensor or broken wiring may cause extended cranking or a no-start. Intermittent sensors often cause rough running or stalling before total failure.