Parts for your 2005 Honda Civic-Throttle position sensors

2005 Honda Civic throttle-position-sensors (TPS)

Technical sources confirm the 2005 Honda Civic is fitted with a throttle position sensor. The Honda Factory Service Manual for 2001–2005 Civic (PGM-FI section) details the Throttle Position (TP) Sensor and related diagnostics. Honda’s Electronic Parts Catalogue for 2005 Civic shows the TP sensor integrated with the throttle body assembly on D17 and K-series models. The official Honda DTC list for this model includes P0121, P0122 and P0123 (throttle/pedal position circuit), which only appear when a TPS is present. So, yes—this Civic uses a TPS.

On a 2005 Civic, the TPS tracks how far the throttle plate is opened. The ECU uses that signal to manage fuel delivery, ignition timing and automatic transmission shift strategy. In day-to-day terms, it helps the engine respond cleanly when the driver blips the throttle, cruises at a steady speed and accelerates to overtake.

From the factory, the sensor is mounted on the throttle body and, on many variants, Honda supplies it as part of the complete throttle body assembly. Aftermarket options allow the sensor to be replaced on its own. A healthy TPS will sweep smoothly from roughly 0.5 V closed to about 4.5 V wide-open, with no dropouts.

Servicing tips for owners across Australia and New Zealand:

• During routine services, ask for a quick scan of live data to confirm a smooth TPS voltage sweep and check for stored codes (P0121–P0123).
• If cleaning the throttle body, avoid soaking the TPS or blasting it with cleaner—moisture ingress can kill the sensor.
• Inspect the connector for green crust (corrosion) or brittle wiring, especially on vehicles with high kilometres or that see coastal air.
• Symptoms of a dodgy TPS include erratic idle, flat spots on take-off, sudden surging and poor fuel economy.

Replacement notes: where the TPS is serviceable separately, mark the old sensor’s position before removal, fit the new one in the same alignment and verify closed-throttle voltage in spec. After replacing the TPS or disconnecting the battery, perform an idle learn: bring the engine to operating temp, switch all accessories off and let it idle undisturbed for about five minutes, then a further few minutes with the A/C on. Some trims may require a throttle angle or idle learn via a scan tool, which any good workshop can perform.

Technical sources referenced: Honda Civic 2001–2005 Factory Service Manual (Helm Inc., PGM-FI/TP Sensor), Honda Electronic Parts Catalogue (2005 Civic throttle body shows TP sensor), Honda OBD-II DTC coverage for 2005 Civic (P0121–P0123).

Popular questions

Where is the TPS on a 2005 Honda Civic?

It’s bolted to the side of the throttle body on the intake manifold. Follow the air intake duct to the throttle body—the TPS is the small sensor with a 3‑pin electrical connector on the throttle shaft end.

What are common symptoms of a failing TPS?

Hesitation on take-off, hunting or erratic idle, random surging while cruising, poor fuel economy and a check engine light with codes like P0121, P0122 or P0123. Live data will often show a jumpy or dead spot in throttle angle.

Do I need to calibrate or relearn anything after replacing the TPS?

Yes. Align the new sensor to achieve the correct closed‑throttle voltage, then perform an idle learn. Some models benefit from a scan-tool throttle/idle learn procedure to lock it in. A workshop can do this quickly.