Parts for your 2020 Honda Civic-Throttle position sensors

2020 Honda Civic throttle-position-sensors — what they do and how to look after them

Technical documentation confirms the 2020 Honda Civic does use throttle-position-sensors. Honda’s factory service information for the 10th‑generation Civic (covering the 2.0L K20C2 and 1.5L L15B engines) describes an Electronic Throttle Control System with dual TPS elements built into the throttle body (often noted as TP Sensor A and B), plus an accelerator pedal position sensor at the pedal. This is also reflected in OEM diagnostic charts and OBD‑II fault coverage (e.g., P0121–P0124, P2135) in Honda service manuals and mainstream repair databases.

On this Civic, the throttle-position-sensors aren’t a separate cable-era widget, they’re part of the drive‑by‑wire throttle body. Their job is to report the exact angle of the throttle plate so the ECU can manage air, fuel, and ignition with precision. Two sensors reading the same shaft provide redundancy and cross‑checks for safety. That’s why, if the readings don’t agree, the car can throw a code and jump into limp mode to protect the engine and the driver.

As part of routine servicing, throttle-position-sensors don’t require scheduled replacement. What does help is keeping the throttle body clean and ensuring the harness and connectors stay tidy and dry. If the idle hunts, the cruise control drops out, there’s a flat spot on take‑off, or the check engine light flags codes like P0122, P0123, or P2135, it’s time for a proper diagnostic with a scan tool to check live data from both TPS channels.

If a TPS fault is confirmed, the fix on a 2020 Civic is typically replacing the throttle body assembly, because the sensors are integrated and not designed for standalone swap‑outs. After refitting, an idle learn/throttle relearn is required so the ECU can recalibrate the new sensor values. Many workshops will also recommend inspecting the intake duct for leaks, verifying battery health (low voltage can cause false sensor dramas), and performing a software update if Honda has issued one for drivability refinements.

• Good practice: clean the throttle body every 40–60,000 km with the battery disconnected, using throttle‑safe cleaner.
• Use OEM‑quality parts, cheap copies can cause mismatch readings between Sensor A and B.
• After any work, complete the idle learn procedure to avoid rough idle or stalling.

Popular questions

Does the 2020 Honda Civic actually have a separate throttle-position-sensor?
Yes, it has throttle-position-sensors, but they’re built into the electronic throttle body rather than being a separate bolt‑on part. There’s also an accelerator pedal position sensor at the pedal, so the ECU compares pedal demand with the throttle plate position for accuracy and safety.

What are the common signs the TPS is playing up on a 2020 Civic?
Typical clues include hesitation, uneven idle, poor fuel economy, cruise control cutting out, or the car dropping into limp mode. The check engine light may log codes such as P0121–P0124 or P2135. A scan of live data will usually show mismatched readings between the dual TPS channels when there’s a fault.

Can the TPS be replaced on its own, or does the whole throttle body need changing?
On this model, the TPS is integral to the throttle body, so the usual repair is to replace the complete throttle body assembly. After that, an idle learn procedure is essential so the ECU can adapt to the new sensor and throttle plate position.