Parts for your 2012 Honda Accord-Throttle position sensors

2012 Honda Accord throttle position sensor: what it does and how to look after it

For the 2012 Honda Accord, a throttle position sensor (TPS) is definitely used. Honda’s factory service information for the 2012 Accord (PGM-FI, Electronic Throttle Control System) specifies an electronic throttle body that houses dual throttle position sensors (TP Sensor A and TP Sensor B) alongside the throttle actuator. Honda’s parts catalogues list the TPS as integrated into the throttle body assembly, not a separate bolt-on part. In short: the TPS is relevant, it’s fitted, and it’s part of the throttle body on both the 2.4‑litre four‑cylinder and 3.5‑litre V6 engines.

On this Accord, the TPS tells the engine control unit exactly how far the throttle plate is open, so fueling and ignition can be spot‑on whether you’re idling through traffic or overtaking on the open road. Because it’s drive‑by‑wire, the pedal position is read by a pedal sensor, and the throttle body uses the TPS pair to confirm the blade’s actual position. The ECU constantly cross‑checks both TPS signals for accuracy and safety.

When the TPS starts playing up, drivers might notice a lazy throttle response, surging at steady speeds, rough idle, or a check engine light. Common fault codes include P0121–P0123 or P2135. Because the TPS is integrated, a failed sensor typically means replacing the entire throttle body rather than just the sensor.

As part of servicing a 2012 Accord, it’s smart to:

• Inspect and clean the throttle body every 60,000–100,000 km using throttle‑body‑safe cleaner to prevent sticky deposits that can confuse TPS readings.
• Check the throttle body electrical connector for corrosion or bent pins, and ensure good battery health (low voltage can cause ETCS/TPS complaints).
• Scan for stored codes and live data, compare TP Sensor A/B readings—they should track closely.

If replacement is needed, opt for quality OEM or reputable aftermarket throttle body assemblies designed for the 2012 Accord engine code. After refit or a battery disconnect, perform an idle learn procedure so the ECU relearns throttle position and idle control. Many workshops complete this with a scan tool, at home, a warm‑up followed by a controlled idle period with accessories off often does the trick. Always clear codes and verify that both TPS signals agree and the idle is stable.

Bottom line: the TPS is critical to smooth, efficient running on the 2012 Accord, and while it’s not a separate service item, keeping the throttle body clean and connections solid will help it go the distance.

Popular questions

Does a 2012 Honda Accord have a separate throttle position sensor I can change on its own?
No. On this model the TPS is built into the electronic throttle body as two sensors (A and B). If the TPS fails, the usual repair is to replace the whole throttle body assembly. That’s why you won’t see a standalone TPS listed in most parts catalogues for this year.

How often should the throttle body/TPS be serviced on a 2012 Accord?
There’s no fixed interval for the TPS itself, but cleaning the throttle body every 60,000–100,000 km helps prevent sticky operation and odd idle behaviour. During regular services, a quick scan for codes and a visual check of the connector and wiring are good practice.

Do I need to calibrate the TPS after replacing the throttle body?
After replacement or a battery reset, the ECU needs to relearn the throttle/idle settings. Many workshops use a scan tool to run an idle learn. At home, allowing the engine to reach operating temperature and idle undisturbed for several minutes with all accessories off can complete the learn. Always clear fault codes and confirm stable idle and matching TP A/B readings.