Parts for your 2009 Honda Accord-Throttle position sensors

2009 Honda Accord throttle position sensor: fitted and important

Technical sources confirm the 2009 Honda Accord uses a throttle position sensor (TPS). Honda’s 2008–2010 Accord Service Manual (Helm Inc.) describes the Electronic Throttle Control System (ETCS) with dual throttle position sensors “TP Sensor A/B” built into the throttle body, and lists related OBD-II faults such as P0121–P0123 and P0221–P0223. Honda’s genuine parts catalog for the 2009 Accord shows the throttle body assembly (e.g., 2.4L K24Z: 16400-R40-A61, 3.5L J35Z: 16400-R70-A02) incorporating the throttle actuator and integral position sensors, confirming it’s fitted and not typically serviced as a separate bolt-on sensor.

On a 2009 Accord, the TPS tells the engine computer exactly how far the throttle plate is open. Paired with the accelerator pedal position sensor, it helps the ECU meter fuel, manage ignition timing, coordinate automatic transmission shifts, and keep features like cruise control and stability systems behaving. Honda uses two TPS channels inside the throttle body for redundancy, so the car can detect mismatch and go into a safe mode if something’s off.

There isn’t a scheduled replacement interval for the TPS, it’s a “replace on fault” item. Common clues it’s unhappy include a check engine light, lazy throttle response, surging or stalling at idle, poor fuel economy, and the car dropping into limp mode. Typical fault codes are P0121–P0123 or P0221–P0223. A scan tool can graph the throttle angle, any spikes or flat spots as the pedal is pressed under the bonnet usually point to trouble.

On this model the TPS is integrated into the throttle body, so the fix is usually a complete throttle body replacement rather than just a sensor swap. That sounds a bit spendy, but it’s quick to fit and restores the whole electronic throttle assembly in one go.

• Before replacing, rule out basics: dirty throttle bore, loose grounds, damaged wiring or connectors at the throttle body.
• If replacing the throttle body, fit a new gasket, torque the bolts evenly, and avoid prying on the plastic actuator cap.
• Perform Honda’s idle learn/ETCS reset after any throttle body work or battery disconnect. Expect a few minutes of idling so the ECU can relearn the target position and airflow.

A light clean of the throttle plate during routine servicing (every 40–60,000 kilometres) helps keep the sensor readings stable and the idle smooth. Use throttle-body-safe cleaner only—no harsh abrasives. If the car still idles rough or sets TPS codes after a clean and relearn, it’s time to talk replacement. A good workshop can diagnose it quickly and have it sorted in about an hour or so.

Popular question: Can the TPS on a 2009 Accord be replaced separately?

No. On the 2009 Accord the throttle position sensors are built into the electronic throttle body. If the sensors fail or go out of calibration, Honda’s service information directs replacement of the complete throttle body assembly rather than the sensor alone.

Popular question: Do I need to program anything after fitting a new throttle body?

There’s no coding, but you should carry out Honda’s idle learn procedure so the ECU knows the new throttle’s exact closed and target positions. A quick scan-tool reset of the throttle/idle learn, followed by a warm-up and a few minutes of stable idle, usually does the trick.

Popular question: What symptoms point to a failing TPS on this model?

Look for a check engine light with codes like P0121–P0123 or P0221–P0223, erratic or high idle, hesitation on take-off, surging at cruise, and reduced-power (limp) behaviour. If wiring checks out and a throttle clean plus idle learn don’t settle it down, the throttle body assembly is likely due.