Parts for your 2009 Honda Civic-Crank angle sensor

2009 Honda Civic crank-angle sensor: what it is, why it matters, and how to look after it

Technical sources confirm the 2009 Honda Civic is fitted with what’s commonly called a crank-angle sensor — Honda refers to it as the Crankshaft Position (CKP) sensor. The 2006–2011 Civic Service Manual (Helm Inc.) details CKP sensor operation and diagnostics, including fault codes P0335 and P0339. Honda’s PGM‑FI engine management description explains the ECU’s reliance on CKP input for spark and fuel timing, and Honda’s parts catalog lists the CKP sensor for the 1.8L R18 and 2.0L K-series engines (e.g., OEM part numbers in the 37500‑RNx‑A0x family). So yes — the 2009 Civic uses a crank-angle/crankshaft position sensor.

On this Civic, the crank-angle sensor keeps the engine management on the straight and narrow. It reads a toothed reluctor on the crank, sending the ECU precise signals about crank angle and speed. The ECU then lines up ignition timing, injector pulse, variable valve timing logic, and misfire detection. If the sensor goes out of whack, the car may crank but not start, stumble, or cut out once warm, and will often throw a check engine light with related CKP codes.

The CKP sensor is a sealed, solid-state item with no scheduled maintenance in Honda’s service information. Still, a quick look at each service is smart: check the harness under the bonnet for chafing, make sure the connector is clipped in tight, and keep an eye out for oil seepage at the timing cover that could foul the connector. If symptoms show up — long crank, random stalling, misfires at idle, or the dash light with P0335/P0339 — plan a proper diagnosis before swapping parts.

• Location: typically low on the front of the engine near the crank pulley/timing cover, accessed from under the car or through the wheel arch with the splash guard off.
• Replacement tips: disconnect the battery, safely raise the car, unplug the connector, remove the retaining bolt, and ease the sensor straight out. Lightly oil a new O‑ring, seat the new sensor square, and refit the bolt to spec. Use a quality OEM-equivalent unit to keep signal quality sharp.
• Afterwards: clear codes, check live data for stable RPM, and take a short drive. If faults return, inspect wiring and grounds before blaming the new sensor.

Popular questions about the 2009 Honda Civic crank-angle sensor

Where is the crank-angle sensor on a 2009 Honda Civic?
It’s mounted low on the front of the engine near the crank pulley/timing cover. Most techs access it from underneath or via the left-front wheel arch with the splash shield removed. The connector runs up to the engine harness under the bonnet.

What are the signs the crank-angle sensor is failing?
Common signs include extended cranking, intermittent stalling once warm, rough running at idle, sudden loss of power, and a check engine light with codes like P0335 or P0339. On some cars it may feel like a random cut-out that restarts after cooling down.

Can the car be driven with a dodgy crank-angle sensor?
It may run, but it’s risky. A failing CKP can cause sudden stalls and no-starts, which isn’t ideal in traffic. Best bet is to diagnose and repair promptly to avoid getting stranded and to protect the catalytic converter from misfire damage.