Parts for your 2017 Honda Accord-Throttle position sensors

2017 Honda Accord throttle-position-sensors (TPS): what they do and how to look after them

Technical references confirm the 2017 Honda Accord is fitted with throttle-position-sensors. Honda’s Electronic Throttle Control (ETC) system on both the 2.4L and 3.5L engines uses dual TPS units integrated into the throttle body, with the ECM comparing both signals for safety and accuracy. TPS faults are monitored by the ECM and set DTCs such as P0121, P0122, P0123, P0222, and P0223.

• Honda Service Information (2013–2017 Accord): Electronic Throttle Control System description and DTC P0121–P0223 diagnostics
• Honda OEM parts catalog/diagrams for 2017 Accord (K24W and J35Y): Throttle body assembly with integral, non-serviceable TPS
• Honda diagnostic procedures: Idle Learn/ETCS Relearn required after throttle body replacement or ECM reset

On this Accord, the throttle-position-sensors tell the engine computer exactly how far the throttle plate is open, so fuelling and ignition can be spot-on for smooth take-off, solid mid-range, and clean emissions. With electronic throttle-by-wire, there are usually two TPS tracks inside the throttle body to provide redundancy, plus an accelerator pedal position sensor at the pedal. The ECM cross-checks all of them—if the TPS values don’t match expected behaviour, it throws a code and may limit power to protect the engine.

The TPS on a 2017 Accord isn’t a separate bolt-on part, it’s built into the throttle body and isn’t serviceable on its own. If diagnostics confirm a TPS fault, the fix is a replacement throttle body assembly. After fitting, an idle/throttle learn needs to be done with a scan tool or via the Honda idle learn procedure so the ECM relearns the new sensor positions. Skipping this step can leave the car with a rough idle or odd throttle response.

As part of regular servicing, TPSs don’t need scheduled replacement. What helps is prevention: keep the throttle body clean (no forcing the plate, use throttle-body-safe cleaner), inspect the connector and loom for chafing, and ensure battery voltage and grounds are tip-top—low system voltage can upset sensor readings. If removing the throttle body, replace the gasket, use correct torque, and be mindful some engines have coolant lines to the housing—catch and top up coolant, then bleed as needed. Typical warning signs of TPS trouble include a check engine light, hunting idle, flat spots on acceleration, cruise-control dropouts, and poorer fuel economy. A quick code scan will usually point the way.

Does a 2017 Accord have a separate TPS I can swap, or is it part of the throttle body?

It’s integrated into the throttle body on this model. If the TPS circuit is faulty, the repair is to replace the entire throttle body assembly and then perform an idle/throttle learn so the ECM knows the new sensor’s exact positions.

What are the common symptoms of a failing TPS on a 2017 Honda Accord?

Owners may notice a check engine light with codes like P0121–P0223, a surging or hunting idle, hesitation, cruise-control dropouts, or limp-home behaviour. Fuel economy can slip too. A proper scan and live-data check will confirm whether the TPS signals are out of range or disagreeing with the pedal sensor.

How much does TPS (throttle body) replacement cost and how long does it take?

Because the TPS is part of the throttle body, expect parts and labour to land roughly in the AUD/NZD $500–$1,300 range depending on engine and parts choice. Labour is usually about 1–2 hours, plus time for coolant handling (if fitted) and the idle learn procedure.