Parts for your 2003 Honda Accord-Throttle position sensors

2003 Honda Accord throttle position sensor: what it does and when to replace it

Yes, the 2003 Honda Accord uses a throttle position sensor (TPS). Technical sources such as the Honda Accord 2003–2005 Service Manual (Helm), Electronic Throttle Control and Fuel & Emissions sections, and OBD-II diagnostics for DTCs P0121–P0123/P0222–P0229 confirm TPS monitoring is integral to this model. The 2.4L K24A4 typically has a TPS mounted on the throttle body, while the 3.0L J30A4 V6 uses an electronic throttle body with dual built-in TPS circuits, Honda often supplies the TPS as part of the throttle body assembly for reliability. OEM parts catalogues for these engines also show the TPS as fitted, either as a separate service item (some aftermarket) or integrated with the throttle body.

On a 2003 Accord, the TPS tells the engine control module exactly how far the throttle plate is open. That signal helps the ECU manage fuel delivery, ignition timing, idle control and transmission shift strategy. When it’s spot on, throttle response feels crisp, fuel economy stays tidy, and the auto shifts cleanly. When it’s crook, it can cause flat spots, hunting idle, harsh shifts, higher fuel use and the odd stall under load.

Common symptoms that point to a tired TPS include:

• Check Engine Light with codes like P0121–P0123 or P0222–P0229
• Surging or hesitation on light throttle, rough or high idle
• Poor shift quality in autos, or limp-home behaviour

For the K24 four-cylinder, the TPS may be detachable from the throttle body. If replacing it, mark the original orientation, avoid twisting the throttle shaft, and snug the new sensor evenly so the signal tracks smoothly from closed to wide open. Many techs perform a throttle/idle relearn afterwards with a scan tool or via the service procedure so it idles properly. For the J30 V6, the TPS is integrated, the usual fix is replacing the throttle body assembly, then completing the idle learn. Either way, inspect and clean the throttle bore and plate with sensor-safe cleaner, check the connector for green crusties, and verify 5V reference, ground and signal with a multimeter under the bonnet before ordering parts.

Service tip: on vehicles around the 200–250,000 km mark, it’s smart to combine a throttle body clean, PCV check and TPS sweep test during a routine service. Use quality parts, a fresh throttle body gasket if removed, and keep everything torqued correctly. That small bit of attention keeps the Accord feeling sharp and easy on fuel.

Popular questions

Where is the TPS on a 2003 Honda Accord?

On the 2.4L K24, it’s mounted on the side of the throttle body at the intake manifold. On the 3.0L V6 J30, the throttle body is electronic and houses dual TPS circuits internally, so it’s part of that unit. Either way, access is under the bonnet at the front/side of the intake.

Can the TPS be replaced without changing the whole throttle body?

Often yes on the 2.4L K24, depending on the supplier, the original Honda part may be bundled with the throttle body, but quality aftermarket sensors are available. On the V6 J30, the TPS is integrated, so replacement typically means a complete throttle body. After fitting, perform an idle/throttle relearn so it behaves properly.

Do I need to recalibrate the TPS after replacement?

A relearn is recommended. Many scan tools support a throttle/idle learn procedure, and Honda’s service steps allow a manual process in a pinch. Skipping this can leave the idle high or unstable and may trigger new fault codes.