Parts for your 2004 Honda Accord-Throttle position sensors

2004 Honda Accord Throttle Position Sensor (TPS)

Based on the Honda Accord 2003–2007 Service Manual (PGM-FI/ETCS sections), factory diagnostic trouble codes P0121–P0123 for the throttle position (TP) circuit, and Honda’s parts catalogue for the 7th‑gen Accord, the 2004 Honda Accord does use a throttle position sensor. It’s built into the electronic throttle body on both the 2.4‑litre four‑cylinder and the 3.0‑litre V6, and provides real‑time throttle plate angle feedback to the PCM. Several workshop information systems (e.g., Honda service literature, Mitchell1/ProDemand, ALLDATA) describe dual TP sensors inside the throttle body and an accelerator pedal position (APP) sensor at the pedal.

On this model, the TPS forms part of the Electronic Throttle Control System. It tells the car’s computer exactly how far the throttle plate is open, so fuelling, spark, and transmission shift strategy stay on point. The system uses two TP signals for redundancy and safety. If they disagree or go out of range, the PCM logs a fault and may drop into limp mode to protect the engine and transmission.

When owners report lazy throttle response, erratic idle, sudden surging, or a Check Engine Light with codes like P0121, P0122, or P0123, the TPS circuit is a usual suspect. Because the TPS on many 2004 Accords is integrated, Honda typically supplies the complete throttle body rather than a separate sensor. Aftermarket standalone TPS units exist for some variants, but alignment and calibration are fiddly and can lead to repeat faults if not spot‑on. Most workshops prefer replacing the throttle body assembly if the TP sensors are confirmed faulty.

As part of routine servicing, it’s worth keeping the throttle body clean. A light clean with throttle‑safe cleaner (engine off, battery disconnected, no forcing the electronic throttle plate) can prevent sticky plate behaviour that mimics TPS faults. Always check wiring and connectors for corrosion or damage before condemning the sensor—many “sensor” faults trace back to a poor earth or chafed loom.

After throttle body replacement or a major clean, perform a throttle/idle relearn. With a scan tool this takes a few minutes, without one, follow Honda’s idle learn procedure (warm the engine fully, all loads off, allow it to idle undisturbed for several minutes). Clearing codes and confirming live data for both TP signals are tracking smoothly is the final step. Done right, the Accord’s throttle response returns to being smooth, predictable, and efficient across Kiwi and Aussie roads alike.

• Common signs: erratic idle, flat spots, surging, high fuel use, CEL with TP codes.
• Best practice: verify power/earth, inspect connectors, clean throttle body, then replace if TP sensors fail tests.
• Don’t skip: throttle/idle relearn after service.

Does the 2004 Accord’s TPS come separate from the throttle body?

From factory documentation and parts listings, the TPS is integrated into the electronic throttle body on most 2004 Accords. Honda generally supplies the throttle body assembly. Some aftermarket suppliers offer separate TPS units for certain engines, but correct indexing and calibration are critical, and many techs stick with the full assembly for reliability.

What symptoms point to a dodgy TPS on a 2004 Accord?

Think uneven idle, throttle hesitation, sudden surges, poor fuel economy, and a Check Engine Light with P0121, P0122, or P0123. Scan data usually shows TP readings jumping around or not matching commanded throttle angle. Always rule out a dirty throttle plate and wiring issues first.

Is an idle relearn needed after TPS/throttle body work?

Yes. Whether the throttle body was cleaned or replaced, an idle/throttle relearn helps the PCM re‑establish correct control. Use a scan tool procedure or follow Honda’s manual method once the engine is at operating temperature. Skipping this can leave the idle high, low, or hunting.