Parts for your 2021 Honda Civic-Throttle position sensors

2021 Honda Civic throttle position sensors (TPS)

Based on Honda’s 10th‑generation Civic Workshop Manual (2016–2021) under Electronic Throttle Control, and the 2021 Honda Genuine Parts Catalogue for the throttle body assembly, the 2021 Honda Civic is equipped with throttle position sensors. The model uses drive‑by‑wire: a throttle body with dual, integrated TPS tracks plus an accelerator pedal position (APP) sensor at the pedal. The TPS elements aren’t typically serviced separately, they’re built into the throttle body and read by the PCM/ECU. These technical sources confirm that TPS is relevant and used on the 2021 Honda Civic.

The throttle position sensors on a 2021 Honda Civic sit inside the electronic throttle body and constantly report the actual blade angle to the ECU. Paired with the accelerator pedal position sensor, they let the ECU compare “driver demand” to “throttle reality”, coordinating fuel, spark, boost (where applicable), and transmission behaviour. Having two TPS tracks adds redundancy and accuracy, helping the car deliver smooth take‑offs, tidy overtakes, and stable idle even with the A/C on or when stuck in weekend traffic. It’s a clever, quietly busy part that keeps the Civic feeling crisp and predictable.

There’s no scheduled replacement for the TPS on this model, it’s looked after as part of the electronic throttle body during routine servicing. For most owners, that means keeping the intake system clean and sealed, and having a technician scan live data occasionally to confirm the two TPS signals track together. If drivability goes a bit off—hesitation, weird throttle response, a surging idle, or the dreaded limp‑home—scan for fault codes first. On these Civics, a failing sensor or wiring issue usually logs a code and the ECU will protect itself by limiting throttle.

• Typical clues of TPS trouble: erratic idle, flat spots on light throttle, sudden power loss, or a Check Engine light with throttle correlation codes.
• When replacement’s needed, the fix is generally a complete throttle body swap rather than a standalone sensor. Genuine or quality OEM‑equivalent units are recommended.
• After throttle body work or heavy cleaning, perform an idle/throttle learn with a scan tool or the prescribed Honda idle‑learn routine so the ECU relearns blade position.
• Don’t spray harsh cleaners into the throttle while powered, and avoid back‑probing sealed connectors—use proper service data and pin‑out tools.

Done right, servicing of the 2021‑Honda‑Civic throttle‑position‑sensors is straightforward and keeps the hatch or sedan running sweet across Aussie and Kiwi roads.

Popular questions

Does a 2021 Honda Civic have a separate TPS I can change?
On this model the throttle position sensors are built into the electronic throttle body as dual tracks. In most markets they’re not sold separately, so the usual repair is to replace the throttle body assembly if the TPS signals are faulty. A technician will confirm with scan data before recommending parts.

What symptoms point to a failing TPS on a 2021 Civic?
Common signs include a surging or hunting idle, hesitation on light throttle, sudden loss of power with a Check Engine light, or the car dropping into limp mode. The ECU often stores correlation or performance codes when the two TPS signals don’t agree, which helps pinpoint the fault quickly.

Is a relearn needed after throttle body service?
Yes. After replacing the throttle body or doing significant cleaning, the ECU needs an idle/throttle position learn so it knows the new blade positions. A workshop can run the procedure with a scan tool, or follow the Honda idle‑learn steps involving warming the engine and allowing a controlled idle period.