Parts for your 2011 Honda Civic-Camshaft sensor

2011 Honda Civic camshaft sensor: purpose, servicing and FAQs

Based on technical references including the Honda Civic 2011 Service Manual (R18A and K20Z3 engines), Honda EPC/parts catalogue listings, and OE supplier application guides (NTK/NGK and Bosch), the 2011 Honda Civic is fitted with a camshaft position sensor (CMP). Non-Si models with the 1.8L R18 engine use a CMP on the intake cam, while the Civic Si with the 2.0L K-series typically uses two (CMP A and CMP B). Related factory diagnostics include DTCs such as P0340/P0341, confirming the vehicle’s reliance on the CMP for timing and VTEC control.

The camshaft sensor tells the ECU exactly where the cam is in its rotation, so fuel injection and spark timing land spot-on. On i-VTEC Civics, it also helps the ECU verify cam advance, keeping idle smooth, starts clean, and fuel economy on point. When the sensor goes out of whack, the dash may light up, the engine can crank longer than normal, and performance can feel a bit doughy.

During regular servicing, the CMP isn’t a scheduled replacement item, but it’s smart to inspect the connector and wiring for oil wicking, brittleness, or corrosion. Fresh, correct-grade engine oil and timely filter changes matter too, because filthy oil can upset cam phasing and make the ECU think the sensor’s the culprit. If replacement is needed, a technician will disconnect the battery, unplug the sensor, remove the retaining bolt, swap the O-ring, lightly oil the new O-ring, and seat the sensor squarely before tightening to the workshop manual spec. Always use OE or reputable OE-equivalent parts, and on K-series Si models, confirm whether the faulty unit is Sensor A (intake) or Sensor B (exhaust).

• Common symptoms: hard or delayed starting, rough idle, reduced pep, increased fuel use, and Check Engine Lamp with codes like P0340/P0341.
• Quick checks: verify the harness isn’t pinched under the engine cover, clean the connector pins, and rule out low oil level or overdue services.
• After replacement: clear codes, perform a short road test with a gentle warm-up so the ECU can relearn cam/crank correlation.

With the right part and a tidy install, most owners find the Civic snaps back to its usual reliable, low-fuss behaviour.

Popular questions

Where is the camshaft sensor on a 2011 Honda Civic?
On the 1.8L R18, it’s mounted at the end of the cylinder head on the intake cam side. On the 2.0L Si, there are typically two—one on each cam. Access is under the bonnet near the timing end, removing the engine cover helps.

Can the car be driven with a failing camshaft sensor?
It may run but can be hard to start, go into a reduced-power strategy, or even stall. It’s best to get it diagnosed and sorted promptly to avoid unsafe driving and potential catalyst damage from misfires.

Does a new camshaft sensor need programming?
No special programming is usually required on the 2011 Civic. After fitment, clear any fault codes and allow a brief relearn during normal driving. Always confirm there are no lingering wiring or oiling issues.