Parts for your 2019 Honda Civic-Throttle position sensors

2019 Honda Civic throttle position sensors (TPS): purpose, care and replacement

Technical sources for the 10th‑gen Honda Civic (2019 model year) confirm the car uses Electronic Throttle Control. Honda factory service information for this Civic details two throttle position sensors built into the electronic throttle body, along with two accelerator pedal position sensors. Honda’s listed OBD‑II diagnostics for the model—including TPS and correlation codes such as P0121, P0122, P0123 and P2135—also reference these sensors. So, throttle position sensors are absolutely fitted and relevant on the 2019 Honda Civic.

On this Civic, the TPS tracks the exact angle of the throttle plate and feeds that to the engine control unit (ECU). Working as a matched pair, the sensors let the ECU compare signals for accuracy, smoothing throttle response, trimming fuel and spark, and keeping emissions tidy. Because it’s a drive‑by‑wire setup, the TPS is integral to the throttle body and is a key safety item—if the paired signals don’t agree, the ECU can drop the car into limp mode to protect the engine and driver.

For servicing, the TPS isn’t a separate bolt‑on like older cable‑throttle cars. It’s typically replaced with the throttle body assembly. A workshop scan tool is recommended to run throttle/idle learn procedures after replacement or battery disconnection, ensuring the ECU knows the new sensor’s zero and full‑angle positions. Under the bonnet, it pays not to force the throttle plate by hand, and to use throttle‑body‑safe cleaner if carbon needs to be cleared—sprays straight into sensitive electronics are a no‑go.

• Common signs of TPS or throttle body drama: erratic idle, flat spots on take‑off, sudden loss of power, cruise control drop‑outs, and the MIL/engine light with TPS‑related DTCs.
• Preventative care: keep the air filter fresh, check for intake leaks, and avoid flooding the throttle body with solvent during cleans.
• Replacement notes: use quality parts, verify grounds and connectors, clear codes, and perform an idle/throttle learn. A short road test to confirm tip‑in behaviour and steady idle is smart practice.

Owners who stay on top of intake health and follow proper relearn steps after any throttle body work generally enjoy crisp throttle feel, stable idle, and fewer surprises across many kilometres of Aussie and Kiwi motoring.

Popular questions about 2019 Honda Civic throttle position sensors

Does the 2019 Civic have both a TPS and an accelerator pedal sensor?
Yes. The throttle body houses dual throttle position sensors while the accelerator pedal has its own dual position sensors. The ECU cross‑checks both sides to deliver smooth response and built‑in safety redundancy.

Can the TPS be replaced on its own, or is it part of the throttle body?
On this model it’s generally integrated into the electronic throttle body and serviced as a complete unit. After replacement, a throttle/idle learn with a scan tool (or the Honda‑specified procedure) should be done to prevent rough idle or hesitant take‑off.

What are the risks of driving with a faulty TPS?
The car may run in limp mode, idle poorly, or surge and hesitate. It can also log DTCs and disable cruise control. It’s best to diagnose and repair promptly to avoid unsafe behaviour and potential catalyst damage from misfuelled operation.