Parts for your 2013 Honda Civic-Throttle position sensors

2013 Honda Civic throttle-position-sensors: what they do and how to look after them

Technical sources, including the Honda Factory Service Manual for the 2012–2015 Civic (Fuel & Emissions: Electronic Throttle Control System) and Honda ServiceNews guidance on electronic throttle bodies, confirm the 2013 Honda Civic is fitted with throttle-position-sensors. Specifically, there are dual throttle position (TP) sensors integrated into the electronic throttle body, along with dual accelerator pedal position sensors at the pedal. On this model, the TP sensors are part of the throttle body assembly and are not supplied by Honda as a separate sensor.

On a 2013 Civic, the throttle-position-sensors tell the engine control unit the exact angle of the throttle plate. Paired with the accelerator pedal sensors, they let the ECU meter air precisely, smoothing out acceleration, improving fuel economy, and keeping emissions in check. The Civic uses a “drive-by-wire” setup, so consistent, accurate TP signals are critical for crisp throttle response and a steady idle.

Servicing-wise, throttle-position-sensors don’t have a set replacement interval, but the electronic throttle body does appreciate periodic attention. If the car shows erratic idle, sluggish take-off, “limp” mode, or a check engine light with TP-related fault codes (such as P0121–P0124 or P2135), start with inspection and cleaning rather than parts-cannon replacement.

• Clean the throttle body: With the battery disconnected, remove the air duct and gently clean carbon from the throttle plate and bore using throttle-body-safe cleaner and a lint-free cloth. Don’t force the plate open by hand, use light pressure only.
• Gasket and reassembly: If the body is removed, fit a new gasket and torque fasteners to spec. Reconnect everything carefully, checking for vacuum leaks at hoses and clamps.
• Idle/throttle learn: After cleaning or a battery disconnect, perform an idle learn. Warm the engine fully, switch off all loads (A/C, lights), then let it idle undisturbed for a few minutes so the ECU relearns the target idle. Some scan tools can run an ETC reset if needed.

If TP sensor faults persist or signals from the dual sensors don’t track as the ECU expects, replacement typically means a complete throttle body assembly. Use OE-quality parts and clear codes, then confirm operation with live data. Note the accelerator pedal sensors are separate items—don’t mix them up when diagnosing.

FAQs

Does a 2013 Honda Civic have a separate throttle-position sensor I can replace?
Honda integrates the throttle-position-sensors into the electronic throttle body on this model. From the dealer, the sensor isn’t sold separately—replacement is usually the entire throttle body. Some aftermarket options list a standalone TPS, but fitment and reliability can vary, so many workshops stick with a complete assembly to avoid comebacks.

What are common signs the throttle-position-sensors are playing up?
Drivers may notice a rough or hunting idle, flat spots on acceleration, unexpected “limp” mode, or a check engine light. Diagnostic codes often include P0121–P0124 or correlation faults like P2135. Before condemning parts, rule out throttle-body carbon build-up, intake leaks, poor grounds, and wiring issues, as these can mimic sensor faults.

Do the throttle-position-sensors need recalibration after cleaning or a battery disconnect?
After cleaning the throttle body or disconnecting the battery, it’s good practice to carry out an idle/throttle learn procedure so the ECU can relearn the throttle plate’s home position. Many Civics will relearn after a proper warm-up and a few minutes of no-load idle, some scan tools offer an ETC reset for a quicker, more controlled result.