Parts for your 2012 Honda Stream-Throttle position sensors

2012 Honda Stream throttle-position-sensors

Based on Honda’s own technical literature for the RN6–RN9 Stream (Electronic Throttle Control section of the Honda Service Manual) and Honda parts catalogues for the R18A/R20A engines, the 2012 Honda Stream does use throttle position sensors. They’re built into the electronic throttle body as dual, redundant sensors (often referenced as TP Sensor A and TP Sensor B). These are critical inputs for the PCM and are not typically serviced separately from the throttle body on this model. Honda diagnostic coverage also lists related DTCs (e.g., P0121–P0123, P0221–P0223, P2135), confirming TPS functionality on this vehicle.

On the 2012 Honda Stream, the throttle-position-sensors tell the engine computer exactly how far the throttle plate is open, so fuelling and ignition can be spot-on. Because it’s a drive-by-wire setup, accuracy and redundancy matter, that’s why Honda integrates dual sensors into the throttle body. If readings disagree or drift out of spec, the car can slip into limp mode to keep things safe.

For day-to-day servicing, the best “maintenance” for the TPS is looking after the throttle body. A careful clean of the throttle bore and plate every 40–60,000 kilometres helps prevent sticky operation that can confuse the sensors. Don’t force the electronic throttle plate open by hand, have the ignition off and use a non-residue throttle cleaner with a soft cloth. Always check the throttle body gasket if it’s removed.

• Common signs of TPS trouble: erratic idle, flat spots on take-off, sudden loss of power, poor fuel economy, or a check engine light with the codes above.
• Before replacement, inspect wiring and connectors for corrosion or rub-through, voltage drop or a bad earth can mimic a failed sensor.

If the TPS has actually failed on a 2012 Stream, the practical repair is replacing the throttle body assembly. After installation, a throttle/idle learn is needed so the PCM knows the new sensor positions. With a scan tool, run the ETC relearn or, if following Honda’s manual method, warm the engine fully, switch all loads off, then allow it to idle undisturbed for several minutes. It’s also wise to clear codes, verify live data for TP Sensor A/B agreement, and road test for smooth tip-in and no stalling. Quality parts (OE or reputable aftermarket) and fresh gasket torqueed to spec will keep the Stream happy for many more kays.

Popular questions about 2012 Honda Stream throttle-position-sensors

Where is the TPS on a 2012 Honda Stream?
The TPS is built into the electronic throttle body on the intake manifold. It isn’t a separate bolt-on sensor like older cable-throttle Hondas. The assembly houses two TPS circuits (A and B) for redundancy, so if one drifts, the other can flag a mismatch to the PCM.

Can the TPS be replaced separately on this model?
In most cases, no. Honda supplies the TPS as part of the throttle body assembly for the RN6–RN9 Stream. Some aftermarket options claim standalone sensors, but fitment and calibration can be hit-and-miss. Replacing the whole throttle body and performing an idle/throttle relearn is the reliable fix.

Do I need a relearn after cleaning or replacement?
Yes. Any time the throttle body is cleaned heavily, disconnected, or replaced, run a throttle/idle learn. This lets the PCM recalibrate the closed and part-open positions for the TPS, preventing rough idle or hunting. A capable scan tool makes it quick, otherwise follow the Honda manual’s warm-up and idle procedure.